diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/BaseMapper.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/BaseMapper.java
index ce840459..25f4627b 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/BaseMapper.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/BaseMapper.java
@@ -490,6 +490,16 @@ public interface BaseMapper<T> {
         return MapperUtil.queryRelations(this, MapperUtil.getSelectOneResult(selectListByQuery(queryWrapper)));
     }
 
+    /**
+     * 根据主表主键来查询 1 条数据。
+     *
+     * @param id 主表主键
+     * @return 实体类数据
+     */
+    default T selectOneWithRelationsById(Serializable id) {
+        return MapperUtil.queryRelations(this, selectOneById(id));
+    }
+
     /**
      * 根据查询条件来查询 1 条数据。
      *