diff --git a/src/main/java/com/zsc/edu/gateway/framework/DeptTreeUtil.java b/src/main/java/com/zsc/edu/gateway/framework/DeptTreeUtil.java
new file mode 100644
index 0000000..3c75c53
--- /dev/null
+++ b/src/main/java/com/zsc/edu/gateway/framework/DeptTreeUtil.java
@@ -0,0 +1,66 @@
+package com.zsc.edu.gateway.framework;
+
+import com.zsc.edu.gateway.modules.system.entity.Dept;
+import com.zsc.edu.gateway.modules.system.entity.User;
+import com.zsc.edu.gateway.modules.system.vo.DeptTree;
+import com.zsc.edu.gateway.modules.system.vo.UserTree;
+import org.springframework.stereotype.Component;
+
+import java.util.*;
+import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+@Component
+public class DeptTreeUtil {
+
+    public static <E> List<E> makeTree(List<E> list, Predicate<E> rootCheck, BiFunction<E, E, Boolean> parentCheck, BiConsumer<E, List<E>> setSubChildren) {
+        return list.stream()
+                .filter(rootCheck)
+                .peek(x -> setSubChildren.accept(x, makeChildren(x, list, parentCheck, setSubChildren)))
+                .collect(Collectors.toList());
+    }
+
+    private static <E> List<E> makeChildren(E parent, List<E> allData, BiFunction<E, E, Boolean> parentCheck, BiConsumer<E, List<E>> setSubChildren) {
+        return allData.stream()
+                .filter(x -> parentCheck.apply(parent, x))
+                .peek(x -> setSubChildren.accept(x, makeChildren(x, allData, parentCheck, setSubChildren)))
+                .collect(Collectors.toList());
+    }
+
+    public static List<DeptTree> buildDeptTree(List<Dept> depots, Map<Long, List<User>> userMap) {
+        List<DeptTree> deptTrees = depots.stream()
+                .map(DeptTreeUtil::convertToDeptTree)
+                .collect(Collectors.toList());
+
+        deptTrees.forEach(deptTree -> {
+            List<User> users = userMap.getOrDefault(deptTree.getId(), Collections.emptyList());
+            deptTree.setMembers(users.stream()
+                    .map(DeptTreeUtil::convertToUserTree)
+                    .collect(Collectors.toList()));
+        });
+
+        return makeTree(
+                deptTrees,
+                deptTree -> deptTree.getPid() == null || deptTree.getPid() == 0L,
+                (parent, child) -> parent.getId().equals(child.getPid()),
+                DeptTree::setChildren
+        );
+    }
+
+    private static DeptTree convertToDeptTree(Dept dept) {
+        DeptTree deptTree = new DeptTree();
+        deptTree.setId(dept.getId());
+        deptTree.setPid(dept.getPid());
+        deptTree.setName(dept.getName());
+        return deptTree;
+    }
+
+    private static UserTree convertToUserTree(User user) {
+        UserTree userTree = new UserTree();
+        userTree.setId(user.getId());
+        userTree.setName(user.getName());
+        return userTree;
+    }
+}
diff --git a/src/main/java/com/zsc/edu/gateway/modules/attachment/vo/AttachmentVo.java b/src/main/java/com/zsc/edu/gateway/modules/attachment/vo/AttachmentVo.java
new file mode 100644
index 0000000..1de36e1
--- /dev/null
+++ b/src/main/java/com/zsc/edu/gateway/modules/attachment/vo/AttachmentVo.java
@@ -0,0 +1,12 @@
+package com.zsc.edu.gateway.modules.attachment.vo;
+
+import lombok.Data;
+
+/**
+ * @author zhuang
+ */
+@Data
+public class AttachmentVo {
+    public String fileName;
+    public String url;
+}
diff --git a/src/main/java/com/zsc/edu/gateway/modules/notice/repo/MessageAttachmentRepository.java b/src/main/java/com/zsc/edu/gateway/modules/notice/repo/MessageAttachmentRepository.java
new file mode 100644
index 0000000..2931591
--- /dev/null
+++ b/src/main/java/com/zsc/edu/gateway/modules/notice/repo/MessageAttachmentRepository.java
@@ -0,0 +1,7 @@
+package com.zsc.edu.gateway.modules.notice.repo;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.zsc.edu.gateway.modules.notice.entity.MessageAttachment;
+
+public interface MessageAttachmentRepository extends BaseMapper<MessageAttachment> {
+}
diff --git a/src/main/java/com/zsc/edu/gateway/modules/notice/service/MessageAttachmentService.java b/src/main/java/com/zsc/edu/gateway/modules/notice/service/MessageAttachmentService.java
new file mode 100644
index 0000000..12e302f
--- /dev/null
+++ b/src/main/java/com/zsc/edu/gateway/modules/notice/service/MessageAttachmentService.java
@@ -0,0 +1,7 @@
+package com.zsc.edu.gateway.modules.notice.service;
+
+import com.baomidou.mybatisplus.extension.service.IService;
+import com.zsc.edu.gateway.modules.notice.entity.MessageAttachment;
+
+public interface MessageAttachmentService extends IService<MessageAttachment> {
+}
diff --git a/src/main/java/com/zsc/edu/gateway/modules/notice/service/impl/MessageAttachmentServiceImpl.java b/src/main/java/com/zsc/edu/gateway/modules/notice/service/impl/MessageAttachmentServiceImpl.java
new file mode 100644
index 0000000..32e0d62
--- /dev/null
+++ b/src/main/java/com/zsc/edu/gateway/modules/notice/service/impl/MessageAttachmentServiceImpl.java
@@ -0,0 +1,16 @@
+package com.zsc.edu.gateway.modules.notice.service.impl;
+
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.zsc.edu.gateway.modules.notice.entity.MessageAttachment;
+import com.zsc.edu.gateway.modules.notice.repo.MessageAttachmentRepository;
+import com.zsc.edu.gateway.modules.notice.service.MessageAttachmentService;
+import lombok.AllArgsConstructor;
+import org.springframework.stereotype.Service;
+
+/**
+ * @author zhuang
+ */
+@Service
+@AllArgsConstructor
+public class MessageAttachmentServiceImpl extends ServiceImpl<MessageAttachmentRepository, MessageAttachment> implements MessageAttachmentService {
+}
diff --git a/src/main/java/com/zsc/edu/gateway/modules/system/vo/DeptTree.java b/src/main/java/com/zsc/edu/gateway/modules/system/vo/DeptTree.java
new file mode 100644
index 0000000..93a3657
--- /dev/null
+++ b/src/main/java/com/zsc/edu/gateway/modules/system/vo/DeptTree.java
@@ -0,0 +1,26 @@
+package com.zsc.edu.gateway.modules.system.vo;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.zsc.edu.gateway.modules.system.entity.User;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author zhuang
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class DeptTree {
+
+    private Long id;
+    @JsonIgnore
+    private Long pid;
+    private String name;
+    List<DeptTree> children = new ArrayList<>();
+    List<UserTree> members = new ArrayList<>();
+}
diff --git a/src/main/java/com/zsc/edu/gateway/modules/system/vo/UserTree.java b/src/main/java/com/zsc/edu/gateway/modules/system/vo/UserTree.java
new file mode 100644
index 0000000..7a35ea4
--- /dev/null
+++ b/src/main/java/com/zsc/edu/gateway/modules/system/vo/UserTree.java
@@ -0,0 +1,16 @@
+package com.zsc.edu.gateway.modules.system.vo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * @author zhuang
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class UserTree {
+    private Long id;
+    private String name;
+}