diff --git a/src/models/tree.rs b/src/models/tree.rs
index 3743dd5..aebab80 100644
--- a/src/models/tree.rs
+++ b/src/models/tree.rs
@@ -1,31 +1,46 @@
+use serde::{Deserialize, Serialize};
+
+use crate::store;
+
 use super::{index::Index, object::Hash};
 /*Tree
 * Tree是一个版本中所有文件的集合。从根目录还是，每个目录是一个Tree，每个文件是一个Blob。Tree之间互相嵌套表示文件的层级关系。
 * 每一个Tree对象也是对应到git储存仓库的一个文件，其内容是一个或多个TreeEntry。
 */
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct TreeEntry {
     pub filemode: (String, String), // (type, mode), type: blob or tree; mode: 100644 or 04000
-    pub hash: Hash,                 // blob hash or tree hash
+    pub object_hash: Hash,          // blob hash or tree hash
     pub name: String,               // file name
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Tree {
+    #[serde(skip)]
     pub hash: Hash,
     pub entries: Vec<TreeEntry>,
 }
 
 impl Tree {
     pub fn new(index: &Index) -> Tree {
-        unimplemented!()
+        Tree {
+            hash: "".to_string(),
+            entries: Vec::new(),
+        }
     }
 
     pub fn load(hash: &String) -> Tree {
-        unimplemented!()
+        let s = store::Store::new();
+        let tree_data = s.load(hash);
+        let mut tree: Tree = serde_json::from_str(&tree_data).unwrap();
+        tree.hash = hash.clone();
+        tree
     }
 
-    pub fn save(&self) {
-        unimplemented!()
+    pub fn save(&self) -> String {
+        let s = store::Store::new();
+        let tree_data = serde_json::to_string(&self).unwrap();
+        let hash = s.save(&tree_data);
+        hash
     }
 }