diff --git a/src/libappdata/app-category-model.cpp b/src/libappdata/app-category-model.cpp
index 85b936d..ba90504 100644
--- a/src/libappdata/app-category-model.cpp
+++ b/src/libappdata/app-category-model.cpp
@@ -87,23 +87,20 @@ bool AppCategoryModel::filterAcceptsRow(int source_row, const QModelIndex &sourc
 bool AppCategoryModel::lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const
 {
     int result = 0;
-    if (m_mode == FirstLatter) {
-        QString leftKey = AppCategoryModel::getFirstLatterUpper(source_left.data(DataEntity::FirstLetter).toString());
-        QString rightKey = AppCategoryModel::getFirstLatterUpper(source_right.data(DataEntity::FirstLetter).toString());
-
-        result = leftKey.compare(rightKey);
-
-    } else {
-        // 按分类进行排序
+    if (m_mode == Category) {
+        // 按功能分类进行排序
         int leftIndex = getCategoryIndex(source_left.data(DataEntity::Category).toString());
         int rightIndex = getCategoryIndex(source_right.data(DataEntity::Category).toString());
 
         result = (leftIndex < rightIndex) ? -1 : (leftIndex > rightIndex) ? 1 : 0;
     }
 
-    if (result == 0) {
-        // 分类相同时，按打开次数排序; model使用的升序排序，为了保持使用次数多的在前，所以此处使用 > 比较符，
-        return source_left.data(DataEntity::LaunchTimes).toInt() > source_right.data(DataEntity::LaunchTimes).toInt();
+    // 功能分类相同时，也按字母排序
+    if ((result == 0) || (m_mode == FirstLatter)) {
+        QString leftKey = source_left.data(DataEntity::FirstLetter).toString();
+        QString rightKey = source_right.data(DataEntity::FirstLetter).toString();
+
+        result = leftKey.compare(rightKey, Qt::CaseInsensitive);
     }
 
     return result < 0;