diff --git a/src/main/java/cc/ryanc/halo/service/base/CrudService.java b/src/main/java/cc/ryanc/halo/service/base/CrudService.java
index 75b77a16c..0850afbc7 100644
--- a/src/main/java/cc/ryanc/halo/service/base/CrudService.java
+++ b/src/main/java/cc/ryanc/halo/service/base/CrudService.java
@@ -15,70 +15,195 @@ import java.util.Optional;
  *
  * @param <DOMAIN> domain type
  * @param <ID>     id type
+ *
  * @author johnniang
  */
 public interface CrudService<DOMAIN, ID> {
 
-    // **************** Select
 
+    /**
+     * List All
+     *
+     * @return List
+     */
     @NonNull
     List<DOMAIN> listAll();
 
+    /**
+     * List all by sort
+     *
+     * @param sort sort
+     *
+     * @return List
+     */
     @NonNull
     List<DOMAIN> listAll(@NonNull Sort sort);
 
+    /**
+     * List all by pageable
+     *
+     * @param pageable pageable
+     *
+     * @return Page
+     */
     @NonNull
     Page<DOMAIN> listAll(@NonNull Pageable pageable);
 
+    /**
+     * List all by ids
+     *
+     * @param ids ids
+     *
+     * @return List
+     */
     @NonNull
     List<DOMAIN> listAllByIds(@NonNull Collection<ID> ids);
 
+    /**
+     * List all by ids and sort
+     *
+     * @param ids  ids
+     * @param sort sort
+     *
+     * @return List
+     */
     @NonNull
     List<DOMAIN> listAllByIds(@NonNull Collection<ID> ids, @NonNull Sort sort);
 
+    /**
+     * Fetch by id
+     *
+     * @param id id
+     *
+     * @return Optional
+     */
     @NonNull
     Optional<DOMAIN> fetchById(@NonNull ID id);
 
+    /**
+     * Get by id
+     *
+     * @param id id
+     *
+     * @return DOMAIN
+     */
     @NonNull
     DOMAIN getById(@NonNull ID id);
 
+    /**
+     * Get nullable by id
+     *
+     * @param id id
+     *
+     * @return DOMAIN
+     */
     @Nullable
     DOMAIN getNullableById(@NonNull ID id);
 
+    /**
+     * @param id id
+     *
+     * @return boolean
+     */
     boolean existsById(@NonNull ID id);
 
+    /**
+     * exist by id
+     *
+     * @param id id
+     */
     void mustExistById(@NonNull ID id);
 
+    /**
+     * count all
+     *
+     * @return long
+     */
     long count();
 
-    // **************** Create
+    /**
+     * save by domain
+     *
+     * @param domain domain
+     *
+     * @return DOMAIN
+     */
     @NonNull
     DOMAIN create(@NonNull DOMAIN domain);
 
+    /**
+     * save by domains
+     *
+     * @param domains domains
+     *
+     * @return List
+     */
     @NonNull
     List<DOMAIN> createInBatch(@NonNull Collection<DOMAIN> domains);
 
-
-    // **************** Update
+    /**
+     * Update by domain
+     *
+     * @param domain domain
+     *
+     * @return DOMAIN
+     */
     @NonNull
     DOMAIN update(@NonNull DOMAIN domain);
 
+    /**
+     * Update by domains
+     *
+     * @param domains domains
+     *
+     * @return List
+     */
     @NonNull
     List<DOMAIN> updateInBatch(@NonNull Collection<DOMAIN> domains);
 
-
-    // **************** Delete
+    /**
+     * Remove by id
+     *
+     * @param id id
+     *
+     * @return DOMAIN
+     */
     @NonNull
     DOMAIN removeById(@NonNull ID id);
 
+    /**
+     * Remove by id
+     *
+     * @param id id
+     *
+     * @return DOMAIN
+     */
     @Nullable
     DOMAIN removeByIdOfNullable(@NonNull ID id);
 
+    /**
+     * Remove by domain
+     *
+     * @param domain domain
+     */
     void remove(@NonNull DOMAIN domain);
 
+    /**
+     * Remove by ids
+     *
+     * @param ids ids
+     */
     void removeInBatch(@NonNull Collection<ID> ids);
 
+    /**
+     * Remove all by domains
+     *
+     * @param domains domains
+     */
     void removeAll(@NonNull Collection<DOMAIN> domains);
 
+    /**
+     * Remove all
+     */
     void removeAll();
 }