diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index cb6cfea..d95dd69 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -34,7 +34,7 @@ android {
         applicationId = "cn.super12138.todo"
         minSdk = 24
         targetSdk = 35
-        versionCode = 556
+        versionCode = 557
         versionName = "2.0.2"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
diff --git a/app/schemas/cn.super12138.todo.logic.database.TodoDatabase/3.json b/app/schemas/cn.super12138.todo.logic.database.TodoDatabase/3.json
new file mode 100644
index 0000000..73c2e41
--- /dev/null
+++ b/app/schemas/cn.super12138.todo.logic.database.TodoDatabase/3.json
@@ -0,0 +1,64 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 3,
+    "identityHash": "ce6665893b60113c5fcaf00af5c0db57",
+    "entities": [
+      {
+        "tableName": "todo",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`content` TEXT NOT NULL, `subject` INTEGER NOT NULL, `custom_subject` TEXT NOT NULL, `completed` INTEGER NOT NULL, `priority` REAL NOT NULL, `id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL)",
+        "fields": [
+          {
+            "fieldPath": "content",
+            "columnName": "content",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "subject",
+            "columnName": "subject",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "customSubject",
+            "columnName": "custom_subject",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "isCompleted",
+            "columnName": "completed",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "priority",
+            "columnName": "priority",
+            "affinity": "REAL",
+            "notNull": true
+          },
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": true,
+          "columnNames": [
+            "id"
+          ]
+        },
+        "indices": [],
+        "foreignKeys": []
+      }
+    ],
+    "views": [],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, 'ce6665893b60113c5fcaf00af5c0db57')"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/cn/super12138/todo/constants/Constants.kt b/app/src/main/kotlin/cn/super12138/todo/constants/Constants.kt
index f646298..c448422 100644
--- a/app/src/main/kotlin/cn/super12138/todo/constants/Constants.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/constants/Constants.kt
@@ -6,8 +6,10 @@ object Constants {
 
     const val KEY_TODO_FAB_TRANSITION = "todo_fab"
     const val KEY_TODO_CONTENT_TRANSITION = "todo_content"
+    const val KEY_TODO_SUBJECT_TRANSITION = "todo_subject"
 
     const val DB_NAME = "todo"
+    const val DB_TABLE_NAME = "todo"
 
     const val SP_NAME = "cn.super12138.todo_preferences"
 
diff --git a/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDao.kt b/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDao.kt
index 8ba646a..699a6c1 100644
--- a/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDao.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDao.kt
@@ -14,7 +14,7 @@ interface TodoDao {
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     suspend fun insert(toDo: TodoEntity)
 
-    @Query("SELECT * FROM ${Constants.DB_NAME}")
+    @Query("SELECT * FROM ${Constants.DB_TABLE_NAME}")
     fun getAll(): Flow<List<TodoEntity>>
 
     @Update
@@ -23,7 +23,7 @@ interface TodoDao {
     @Delete
     suspend fun delete(toDo: TodoEntity)
 
-    @Query("DELETE FROM ${Constants.DB_NAME} WHERE id in (:toDoIds)")
+    @Query("DELETE FROM ${Constants.DB_TABLE_NAME} WHERE id in (:toDoIds)")
     suspend fun deleteFromIds(toDoIds: Set<Int>)
 
     /*@Query("DELETE FROM todo")
diff --git a/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDatabase.kt b/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDatabase.kt
index e5db67b..b5d3873 100644
--- a/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDatabase.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoDatabase.kt
@@ -4,9 +4,11 @@ import android.content.Context
 import androidx.room.Database
 import androidx.room.Room
 import androidx.room.RoomDatabase
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
 import cn.super12138.todo.constants.Constants
 
-@Database(entities = [TodoEntity::class], version = 2)
+@Database(entities = [TodoEntity::class], version = 3)
 abstract class TodoDatabase : RoomDatabase() {
     abstract fun toDoDao(): TodoDao
 
@@ -20,6 +22,7 @@ abstract class TodoDatabase : RoomDatabase() {
                     TodoDatabase::class.java,
                     Constants.DB_NAME
                 )
+                    .addMigrations(MIGRATION_2_3)
                     .fallbackToDestructiveMigration()
                     .build()
 
@@ -27,5 +30,11 @@ abstract class TodoDatabase : RoomDatabase() {
                 return instance
             }
         }
+
+        private val MIGRATION_2_3 = object : Migration(2, 3) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL("ALTER TABLE ${Constants.DB_TABLE_NAME} ADD COLUMN custom_subject TEXT NOT NULL DEFAULT ''")
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoEntity.kt b/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoEntity.kt
index 90957b1..cf43621 100644
--- a/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoEntity.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/logic/database/TodoEntity.kt
@@ -3,11 +3,13 @@ package cn.super12138.todo.logic.database
 import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.PrimaryKey
+import cn.super12138.todo.constants.Constants
 
-@Entity(tableName = "todo")
+@Entity(tableName = Constants.DB_TABLE_NAME)
 data class TodoEntity(
     @ColumnInfo(name = "content") val content: String,
     @ColumnInfo(name = "subject") val subject: Int,
+    @ColumnInfo(name = "custom_subject") val customSubject: String = "",
     @ColumnInfo(name = "completed") val isCompleted: Boolean = false,
     @ColumnInfo(name = "priority") val priority: Float,
     @PrimaryKey(autoGenerate = true) @ColumnInfo(name = "id") val id: Int = 0,
diff --git a/app/src/main/kotlin/cn/super12138/todo/logic/model/Subjects.kt b/app/src/main/kotlin/cn/super12138/todo/logic/model/Subjects.kt
index 5fde68e..8a0b8cf 100644
--- a/app/src/main/kotlin/cn/super12138/todo/logic/model/Subjects.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/logic/model/Subjects.kt
@@ -13,7 +13,8 @@ enum class Subjects(val id: Int) {
     Moral(6),
     Chemistry(7),
     History(8),
-    Others(99);
+    Others(99),
+    Custom(100);
 
     fun getDisplayName(context: Context): String {
         val resId = when (this) {
@@ -27,6 +28,7 @@ enum class Subjects(val id: Int) {
             Chemistry -> R.string.subject_chemistry
             History -> R.string.subject_history
             Others -> R.string.subject_others
+            Custom -> R.string.subject_customization
         }
         return context.getString(resId) // 返回资源中的文本
     }
diff --git a/app/src/main/kotlin/cn/super12138/todo/ui/components/ChipGroup.kt b/app/src/main/kotlin/cn/super12138/todo/ui/components/ChipGroup.kt
index bdaabc2..6347f87 100644
--- a/app/src/main/kotlin/cn/super12138/todo/ui/components/ChipGroup.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/ui/components/ChipGroup.kt
@@ -34,23 +34,23 @@ import cn.super12138.todo.utils.VibrationUtils
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
 fun FilterChipGroup(
-    items: List<String>,
+    items: List<ChipItem>,
     defaultSelectedItemIndex: Int = 0,
     onSelectedChanged: (Int) -> Unit = {},
     modifier: Modifier = Modifier
 ) {
     val view = LocalView.current
-    var selectedItemIndex by rememberSaveable { mutableIntStateOf(defaultSelectedItemIndex) }
+    var selectedItemId by rememberSaveable { mutableIntStateOf(defaultSelectedItemIndex) }
 
     FlowRow(modifier = modifier) {
-        items.forEachIndexed { index, item ->
+        items.forEach { item ->
             FilterChipItem(
-                selected = items[selectedItemIndex] == items[index],
-                text = item,
+                selected = item.id == selectedItemId,
+                text = item.text,
                 onClick = {
-                    selectedItemIndex = index
+                    selectedItemId = item.id
                     VibrationUtils.performHapticFeedback(view)
-                    onSelectedChanged(index)
+                    onSelectedChanged(item.id)
                 }
             )
         }
@@ -58,7 +58,7 @@ fun FilterChipGroup(
 }
 
 @Composable
-fun FilterChipItem(
+private fun FilterChipItem(
     selected: Boolean,
     text: String,
     onClick: () -> Unit,
@@ -85,4 +85,9 @@ fun FilterChipItem(
         },
         modifier = Modifier.padding(end = 10.dp)
     )
-}
\ No newline at end of file
+}
+
+data class ChipItem(
+    val id: Int,
+    val text: String
+)
\ No newline at end of file
diff --git a/app/src/main/kotlin/cn/super12138/todo/ui/pages/editor/TodoEditorPage.kt b/app/src/main/kotlin/cn/super12138/todo/ui/pages/editor/TodoEditorPage.kt
index 75043c1..336a189 100644
--- a/app/src/main/kotlin/cn/super12138/todo/ui/pages/editor/TodoEditorPage.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/ui/pages/editor/TodoEditorPage.kt
@@ -34,6 +34,7 @@ import androidx.compose.material3.Text
 import androidx.compose.material3.TextField
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
 import androidx.compose.runtime.mutableIntStateOf
@@ -56,6 +57,7 @@ import cn.super12138.todo.logic.model.Priority
 import cn.super12138.todo.logic.model.Subjects
 import cn.super12138.todo.ui.TodoDefaults
 import cn.super12138.todo.ui.components.AnimatedExtendedFloatingActionButton
+import cn.super12138.todo.ui.components.ChipItem
 import cn.super12138.todo.ui.components.FilterChipGroup
 import cn.super12138.todo.ui.components.LargeTopAppBarScaffold
 import cn.super12138.todo.ui.components.WarningDialog
@@ -80,15 +82,22 @@ fun TodoEditorPage(
     val scrollBehavior = TopAppBarDefaults.exitUntilCollapsedScrollBehavior()
 
     var toDoContent by rememberSaveable { mutableStateOf(toDo?.content ?: "") }
-    var isError by rememberSaveable { mutableStateOf(false) }
-    var selectedSubjectIndex by rememberSaveable { mutableIntStateOf(toDo?.subject ?: 0) }
+    var isErrorContent by rememberSaveable { mutableStateOf(false) }
+    var selectedSubjectId by rememberSaveable { mutableIntStateOf(toDo?.subject ?: 0) }
+    var subjectContent by rememberSaveable { mutableStateOf(toDo?.customSubject ?: "") }
+    var isErrorSubject by rememberSaveable { mutableStateOf(false) }
     var priorityState by rememberSaveable { mutableFloatStateOf(toDo?.priority ?: 0f) }
     var completedSwitchState by rememberSaveable { mutableStateOf(toDo?.isCompleted ?: false) }
 
+    val isCustomSubject by remember {
+        derivedStateOf { selectedSubjectId == Subjects.Custom.id }
+    }
+
     fun checkModifiedBeforeBack() {
         var isModified = false
         if ((toDo?.content ?: "") != toDoContent) isModified = true
-        if ((toDo?.subject ?: 0) != selectedSubjectIndex) isModified = true
+        if ((toDo?.subject ?: 0) != selectedSubjectId) isModified = true
+        if ((toDo?.customSubject ?: "") != subjectContent) isModified = true
         if ((toDo?.priority ?: 0f) != priorityState) isModified = true
         if ((toDo?.isCompleted == true) != completedSwitchState) isModified = true
         if (isModified) {
@@ -123,15 +132,23 @@ fun TodoEditorPage(
                         expanded = true,
                         onClick = {
                             if (toDoContent.trim().isEmpty()) {
-                                isError = true
+                                isErrorContent = true
+                                return@AnimatedExtendedFloatingActionButton
+                            }
+                            if (subjectContent.trim()
+                                    .isEmpty() && selectedSubjectId == Subjects.Custom.id
+                            ) {
+                                isErrorSubject = true
                                 return@AnimatedExtendedFloatingActionButton
                             }
 
-                            isError = false
+                            isErrorContent = false
+                            isErrorSubject = false
                             onSave(
                                 TodoEntity(
                                     content = toDoContent,
-                                    subject = selectedSubjectIndex,
+                                    subject = selectedSubjectId,
+                                    customSubject = subjectContent,
                                     isCompleted = completedSwitchState,
                                     priority = priorityState,
                                     id = toDo?.id ?: 0
@@ -163,10 +180,10 @@ fun TodoEditorPage(
                     value = toDoContent,
                     onValueChange = { toDoContent = it },
                     label = { Text(stringResource(R.string.placeholder_add_todo)) },
-                    isError = isError,
+                    isError = isErrorContent,
                     supportingText = {
-                        AnimatedVisibility(isError) {
-                            Text(stringResource(R.string.error_no_task_content))
+                        AnimatedVisibility(isErrorContent) {
+                            Text(stringResource(R.string.error_no_content_entered))
                         }
                     },
                     modifier = Modifier
@@ -180,11 +197,6 @@ fun TodoEditorPage(
 
             Spacer(Modifier.size(5.dp))
 
-            val subjects = remember {
-                Subjects.entries.map {
-                    it.getDisplayName(context)
-                }
-            }
             Text(
                 text = stringResource(R.string.label_subject),
                 style = MaterialTheme.typography.titleMedium
@@ -192,14 +204,44 @@ fun TodoEditorPage(
 
             Spacer(Modifier.size(5.dp))
 
+            val subjects = remember {
+                Subjects.entries.map {
+                    ChipItem(
+                        id = it.id,
+                        text = it.getDisplayName(context)
+                    )
+                }
+            }
             FilterChipGroup(
                 items = subjects,
-                defaultSelectedItemIndex = toDo?.subject ?: 0,
+                defaultSelectedItemIndex = toDo?.subject ?: Subjects.Chinese.id,
                 onSelectedChanged = {
-                    selectedSubjectIndex = it
+                    selectedSubjectId = it
                 },
                 modifier = Modifier.fillMaxWidth()
             )
+            AnimatedVisibility(isCustomSubject) {
+                with(sharedTransitionScope) {
+                    TextField(
+                        value = subjectContent,
+                        onValueChange = { subjectContent = it },
+                        label = { Text(stringResource(R.string.label_enter_subject_name)) },
+                        isError = isErrorSubject,
+                        supportingText = {
+                            AnimatedVisibility(isErrorSubject) {
+                                Text(stringResource(R.string.error_no_content_entered))
+                            }
+                        },
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .sharedBounds(
+                                sharedContentState = rememberSharedContentState("${Constants.KEY_TODO_SUBJECT_TRANSITION}_${toDo?.id}"),
+                                animatedVisibilityScope = animatedVisibilityScope
+                            )
+                            .padding(top = 5.dp)
+                    )
+                }
+            }
 
             Spacer(Modifier.size(10.dp))
 
diff --git a/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/ManagerFragment.kt b/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/ManagerFragment.kt
index 568af4c..002be0a 100644
--- a/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/ManagerFragment.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/ManagerFragment.kt
@@ -66,10 +66,16 @@ fun ManagerFragment(
                     items = list,
                     key = { it.id }
                 ) { item ->
+                    val subject = if (item.subject == Subjects.Custom.id) {
+                        item.customSubject
+                    } else {
+                        Subjects.fromId(item.subject).getDisplayName(context)
+                    }
+
                     TodoCard(
                         id = item.id,
                         content = item.content,
-                        subject = Subjects.fromId(item.subject).getDisplayName(context),
+                        subject = subject,
                         completed = item.isCompleted,
                         priority = Priority.fromFloat(item.priority),
                         selected = selectedTodoIds.contains(item.id),
diff --git a/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/components/TodoCard.kt b/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/components/TodoCard.kt
index e8b44bd..4a1ceb7 100644
--- a/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/components/TodoCard.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/ui/pages/main/components/TodoCard.kt
@@ -144,12 +144,18 @@ fun TodoCard(
                     }
                 }
 
-                Text(
-                    text = subject,
-                    style = MaterialTheme.typography.labelMedium,
-                    textDecoration = if (completed) TextDecoration.LineThrough else TextDecoration.None,
-                    maxLines = 1
-                )
+                with(sharedTransitionScope) {
+                    Text(
+                        text = subject,
+                        style = MaterialTheme.typography.labelMedium,
+                        textDecoration = if (completed) TextDecoration.LineThrough else TextDecoration.None,
+                        maxLines = 1,
+                        modifier = Modifier.sharedBounds(
+                            sharedContentState = rememberSharedContentState("${Constants.KEY_TODO_SUBJECT_TRANSITION}_$id"),
+                            animatedVisibilityScope = animatedVisibilityScope
+                        )
+                    )
+                }
             }
 
             AnimatedVisibility(!selected && !completed) {
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 316363c..029d959 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -7,7 +7,7 @@
     <string name="placeholder_add_todo">待办内容</string>
     <string name="action_cancel">取消</string>
     <string name="action_save">保存</string>
-    <string name="error_no_task_content">没有输入待办内容</string>
+    <string name="error_no_content_entered">没有输入内容</string>
     <string name="tip_select_this">选择该项</string>
     <string name="tip_mark_completed">标记为已完成</string>
     <string name="subject_chinese">语文</string>
@@ -108,4 +108,6 @@
     <string name="pref_secure_mode_desc">阻止截屏并保护后台预览图</string>
     <string name="label_more">更多</string>
     <string name="happy_birthday">待办1岁生日快乐</string>
+    <string name="subject_customization">自定义</string>
+    <string name="label_enter_subject_name">输入学科名称</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index ea6a218..31c9f35 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -6,7 +6,7 @@
     <string name="placeholder_add_todo">Task content</string>
     <string name="action_cancel">Cancel</string>
     <string name="action_save">Save</string>
-    <string name="error_no_task_content">No task content entered</string>
+    <string name="error_no_content_entered">No content entered</string>
     <string name="tip_select_this">Select this</string>
     <string name="tip_mark_completed">Mark as completed</string>
     <string name="subject_chinese">Chinese</string>
@@ -109,4 +109,6 @@
     <string name="pref_secure_mode_desc">Prevent screenshots and protect the background preview image</string>
     <string name="label_more">More</string>
     <string name="happy_birthday">Happy 1st birthday to ToDo</string>
+    <string name="subject_customization">Customization</string>
+    <string name="label_enter_subject_name">Enter subject name</string>
 </resources>
\ No newline at end of file