diff --git a/src/main/java/run/halo/app/model/entity/PostCategory.java b/src/main/java/run/halo/app/model/entity/PostCategory.java
index 10da86b95..ba7a43a3f 100644
--- a/src/main/java/run/halo/app/model/entity/PostCategory.java
+++ b/src/main/java/run/halo/app/model/entity/PostCategory.java
@@ -12,7 +12,9 @@ import java.util.Objects;
  * @author johnniang
  */
 @Entity
-@Table(name = "post_categories")
+@Table(name = "post_categories",
+    indexes = {@Index(name = "post_categories_post_id", columnList = "post_id"),
+    @Index(name = "post_categories_category_id", columnList = "category_id")})
 @Data
 @ToString(callSuper = true)
 public class PostCategory extends BaseEntity {