diff --git a/app/src/main/kotlin/cn/super12138/todo/logic/model/SortingMethod.kt b/app/src/main/kotlin/cn/super12138/todo/logic/model/SortingMethod.kt
index 9f31dbd..036a2b9 100644
--- a/app/src/main/kotlin/cn/super12138/todo/logic/model/SortingMethod.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/logic/model/SortingMethod.kt
@@ -5,14 +5,16 @@ import cn.super12138.todo.R
 
 enum class SortingMethod(val id: Int) {
     Date(1),
-    Priority(2),
-    Completion(3),
-    AlphabeticalAscending(4),
-    AlphabeticalDescending(5);
+    Subject(2),
+    Priority(3),
+    Completion(4),
+    AlphabeticalAscending(5),
+    AlphabeticalDescending(6);
 
     fun getDisplayName(context: Context): String {
         val resId = when (this) {
             Date -> R.string.sorting_date
+            Subject -> R.string.sorting_subject
             Priority -> R.string.sorting_priority
             Completion -> R.string.sorting_completion
             AlphabeticalAscending -> R.string.sorting_alphabetical_ascending
diff --git a/app/src/main/kotlin/cn/super12138/todo/ui/viewmodels/MainViewModel.kt b/app/src/main/kotlin/cn/super12138/todo/ui/viewmodels/MainViewModel.kt
index db49080..6001e8a 100644
--- a/app/src/main/kotlin/cn/super12138/todo/ui/viewmodels/MainViewModel.kt
+++ b/app/src/main/kotlin/cn/super12138/todo/ui/viewmodels/MainViewModel.kt
@@ -26,6 +26,7 @@ class MainViewModel : ViewModel() {
     val sortedTodos: Flow<List<TodoEntity>> = toDos.map { list ->
         when (appSortingMethod) {
             SortingMethod.Date -> list.sortedBy { it.id }
+            SortingMethod.Subject -> list.sortedBy { it.subject }
             SortingMethod.Priority -> list.sortedByDescending { it.priority } // 优先级高的在前
             SortingMethod.Completion -> list.sortedBy { it.isCompleted } // 未完成的在前
             SortingMethod.AlphabeticalAscending -> list.sortedBy { it.content }
@@ -37,7 +38,7 @@ class MainViewModel : ViewModel() {
         private set
     var showCompletedTodos by mutableStateOf(GlobalValues.showCompleted)
 
-    // 深色模式
+    // 主题颜色
     var appDarkMode by mutableStateOf(DarkMode.fromId(GlobalValues.darkMode))
         private set
     var appContrastLevel by mutableStateOf(ContrastLevel.fromFloat(GlobalValues.contrastLevel))
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 34c11fa..28d2cbf 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -83,6 +83,7 @@
     <string name="pref_view_on_github_desc">查看源代码、提交错误报告和改进建议</string>
     <string name="tip_discard_changes">退出编辑后将无法找回你修改过的数据。确定退出编辑吗？</string>
     <string name="sorting_date">日期</string>
+    <string name="sorting_subject">学科</string>
     <string name="sorting_priority">优先级</string>
     <string name="sorting_completion">完成状态</string>
     <string name="sorting_alphabetical_ascending">首字母（升序）</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index ef1cd49..4b8eb74 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -84,6 +84,7 @@
     <string name="pref_view_on_github_desc">View source code, submit bug reports, and improvement suggestions</string>
     <string name="tip_discard_changes">After exiting edit mode, you will not be able to retrieve the data you have modified. Are you sure you want to exit editing?</string>
     <string name="sorting_date">Date</string>
+    <string name="sorting_subject">Subject</string>
     <string name="sorting_priority">Priority</string>
     <string name="sorting_completion">Completion</string>
     <string name="sorting_alphabetical_ascending">Alphabetical (Ascending)</string>