diff --git a/src/main/java/xyz/playedu/api/mapper/CourseMapper.java b/src/main/java/xyz/playedu/api/mapper/CourseMapper.java
index ba2d609..6395dbc 100644
--- a/src/main/java/xyz/playedu/api/mapper/CourseMapper.java
+++ b/src/main/java/xyz/playedu/api/mapper/CourseMapper.java
@@ -18,7 +18,6 @@ public interface CourseMapper extends BaseMapper<Course> {
 
     List<CourseCategoryCountMapper> getCategoryCount();
 
-    Integer getNoneCategoryCount();
 }
 
 
diff --git a/src/main/java/xyz/playedu/api/service/impl/CourseServiceImpl.java b/src/main/java/xyz/playedu/api/service/impl/CourseServiceImpl.java
index 816d5a3..c4bc6c6 100644
--- a/src/main/java/xyz/playedu/api/service/impl/CourseServiceImpl.java
+++ b/src/main/java/xyz/playedu/api/service/impl/CourseServiceImpl.java
@@ -210,9 +210,7 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course> impleme
 
     @Override
     public Map<Integer, Integer> getCategoryCount() {
-        Map<Integer, Integer> data = getBaseMapper().getCategoryCount().stream().collect(Collectors.toMap(CourseCategoryCountMapper::getCid, CourseCategoryCountMapper::getTotal));
-        data.put(0, getBaseMapper().getNoneCategoryCount());
-        return data;
+        return getBaseMapper().getCategoryCount().stream().collect(Collectors.toMap(CourseCategoryCountMapper::getCid, CourseCategoryCountMapper::getTotal));
     }
 
     @Override
diff --git a/src/main/resources/mapper/CourseMapper.xml b/src/main/resources/mapper/CourseMapper.xml
index 853820f..87df17e 100644
--- a/src/main/resources/mapper/CourseMapper.xml
+++ b/src/main/resources/mapper/CourseMapper.xml
@@ -27,11 +27,4 @@
         FROM `resource_course_category`
         GROUP BY `resource_course_category`.`category_id`;
     </select>
-
-    <select id="getNoneCategoryCount" resultType="java.lang.Integer">
-        SELECT count(DISTINCT `courses`.`id`) AS `total`
-        FROM `courses`
-                 LEFT JOIN `resource_course_category` ON `resource_course_category`.`course_id` = `courses`.`id`
-        WHERE `resource_course_category`.`course_id` IS NULL;
-    </select>
 </mapper>