diff --git a/src/main/java/xyz/playedu/api/controller/backend/CourseController.java b/src/main/java/xyz/playedu/api/controller/backend/CourseController.java
index 2953cfb..198ce72 100644
--- a/src/main/java/xyz/playedu/api/controller/backend/CourseController.java
+++ b/src/main/java/xyz/playedu/api/controller/backend/CourseController.java
@@ -47,6 +47,7 @@ public class CourseController {
         Integer size = MapUtils.getInteger(params, "size", 10);
         String sortField = MapUtils.getString(params, "sort_field");
         String sortAlgo = MapUtils.getString(params, "sort_algo");
+
         String title = MapUtils.getString(params, "title");
         String depIds = MapUtils.getString(params, "dep_ids");
         String categoryIds = MapUtils.getString(params, "category_ids");
@@ -55,14 +56,8 @@ public class CourseController {
         filter.setTitle(title);
         filter.setSortField(sortField);
         filter.setSortAlgo(sortAlgo);
-        if (depIds != null && depIds.length() > 0) {
-            filter.setDepIds(Arrays.stream(depIds.split(",")).map(Integer::valueOf).toArray(Integer[]::new));
-        }
-        if (categoryIds != null && categoryIds.length() > 0) {
-            filter.setCategoryIds(Arrays.stream(categoryIds.split(",")).map(Integer::valueOf).toArray(Integer[]::new));
-        }
-
-        log.info("filter:" + filter);
+        filter.setCategoryIds(categoryIds);
+        filter.setDepIds(depIds);
 
         PaginationResult<Course> result = courseService.paginate(page, size, filter);
         return JsonResponse.data(result);
diff --git a/src/main/java/xyz/playedu/api/service/CourseDepartmentService.java b/src/main/java/xyz/playedu/api/service/CourseDepartmentService.java
index 4a1ccb9..321ea47 100644
--- a/src/main/java/xyz/playedu/api/service/CourseDepartmentService.java
+++ b/src/main/java/xyz/playedu/api/service/CourseDepartmentService.java
@@ -12,7 +12,7 @@ import java.util.List;
  */
 public interface CourseDepartmentService extends IService<CourseDepartment> {
 
-    List<Integer> getCourseIdsByDepIds(Integer[] depIds);
+    List<Integer> getCourseIdsByDepIds(List<Integer> depIds);
 
     List<Integer> getDepIdsByCourseId(Integer courseId);
 
diff --git a/src/main/java/xyz/playedu/api/service/impl/CourseDepartmentServiceImpl.java b/src/main/java/xyz/playedu/api/service/impl/CourseDepartmentServiceImpl.java
index 4193aec..391be83 100644
--- a/src/main/java/xyz/playedu/api/service/impl/CourseDepartmentServiceImpl.java
+++ b/src/main/java/xyz/playedu/api/service/impl/CourseDepartmentServiceImpl.java
@@ -18,29 +18,13 @@ import java.util.List;
 public class CourseDepartmentServiceImpl extends ServiceImpl<CourseDepartmentMapper, CourseDepartment>
         implements CourseDepartmentService {
     @Override
-    public List<Integer> getCourseIdsByDepIds(Integer[] depIds) {
-        List<Integer> ids = new ArrayList<>();
-        List<CourseDepartment> courseDepartments = list(query().getWrapper().in("dep_id", depIds));
-        if (courseDepartments.size() == 0) {
-            return ids;
-        }
-        for (CourseDepartment courseDepartment : courseDepartments) {
-            ids.add(courseDepartment.getCourseId());
-        }
-        return ids;
+    public List<Integer> getCourseIdsByDepIds(List<Integer> depIds) {
+        return list(query().getWrapper().in("dep_id", depIds)).stream().map(CourseDepartment::getCourseId).toList();
     }
 
     @Override
     public List<Integer> getDepIdsByCourseId(Integer courseId) {
-        List<Integer> ids = new ArrayList<>();
-        List<CourseDepartment> courseDepartments = list(query().getWrapper().eq("course_id", courseId));
-        if (courseDepartments.size() == 0) {
-            return ids;
-        }
-        for (CourseDepartment courseDepartment : courseDepartments) {
-            ids.add(courseDepartment.getDepId());
-        }
-        return ids;
+        return list(query().getWrapper().eq("course_id", courseId)).stream().map(CourseDepartment::getDepId).toList();
     }
 
     @Override
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 852e49c..13966a3 100644
--- a/src/main/java/xyz/playedu/api/service/impl/CourseServiceImpl.java
+++ b/src/main/java/xyz/playedu/api/service/impl/CourseServiceImpl.java
@@ -20,6 +20,7 @@ import xyz.playedu.api.types.paginate.PaginationResult;
 import xyz.playedu.api.util.HelperUtil;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Date;
 import java.util.List;
 
@@ -44,15 +45,17 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course> impleme
         if (filter.getTitle() != null && filter.getTitle().length() > 0) {
             wrapper.like("title", "%" + filter.getTitle() + "%");
         }
-        if (filter.getDepIds() != null && filter.getDepIds().length > 0) {
-            List<Integer> courseIds = courseDepartmentService.getCourseIdsByDepIds(filter.getDepIds());
+        if (filter.getDepIds() != null && filter.getDepIds().trim().length() > 0) {
+            List<Integer> depIds = Arrays.stream(filter.getDepIds().split(",")).map(Integer::valueOf).toList();
+            List<Integer> courseIds = courseDepartmentService.getCourseIdsByDepIds(depIds);
             if (courseIds == null || courseIds.size() == 0) {
                 courseIds = HelperUtil.zeroIntegerList();
             }
             wrapper.in("id", courseIds);
         }
-        if (filter.getCategoryIds() != null && filter.getCategoryIds().length > 0) {
-            List<Integer> courseIds = courseCategoryService.getCourseIdsByCategoryIds(List.of(filter.getCategoryIds()));
+        if (filter.getCategoryIds() != null && filter.getCategoryIds().trim().length() > 0) {
+            List<Integer> categoryIds = Arrays.stream(filter.getCategoryIds().split(",")).map(Integer::valueOf).toList();
+            List<Integer> courseIds = courseCategoryService.getCourseIdsByCategoryIds(categoryIds);
             if (courseIds == null || courseIds.size() == 0) {
                 courseIds = HelperUtil.zeroIntegerList();
             }
diff --git a/src/main/java/xyz/playedu/api/types/paginate/CoursePaginateFiler.java b/src/main/java/xyz/playedu/api/types/paginate/CoursePaginateFiler.java
index 08ec1b1..805204e 100644
--- a/src/main/java/xyz/playedu/api/types/paginate/CoursePaginateFiler.java
+++ b/src/main/java/xyz/playedu/api/types/paginate/CoursePaginateFiler.java
@@ -11,9 +11,9 @@ public class CoursePaginateFiler {
 
     private String title;
 
-    private Integer[] depIds;
+    private String depIds;
 
-    private Integer[] categoryIds;
+    private String categoryIds;
 
     private String sortField;