diff --git a/src/commands/add.rs b/src/commands/add.rs
index 2033f3a..7c7f430 100644
--- a/src/commands/add.rs
+++ b/src/commands/add.rs
@@ -5,6 +5,7 @@ use colored::Colorize;
 use crate::commands::status;
 use crate::models::index::FileMetaData;
 use crate::models::*;
+use crate::utils::path_ext::PathExt;
 use crate::utils::util;
 
 /// add是对index的操作，不会对工作区产生影响
@@ -40,7 +41,7 @@ pub fn add(raw_paths: Vec<String>, all: bool, mut update: bool) {
 
 fn add_a_file(file: &Path, index: &mut Index) {
     let workdir = util::get_working_dir().unwrap();
-    if !util::is_sub_path(file, &workdir) {
+    if !file.is_sub_to(&workdir) {
         //文件不在工作区内
         println!("fatal: '{}' is outside workdir at '{}'", file.display(), workdir.display());
         return;
@@ -51,7 +52,7 @@ fn add_a_file(file: &Path, index: &mut Index) {
         return;
     }
 
-    let rel_path = util::get_relative_path(file);
+    let rel_path = file.to_relative();
     if !file.exists() {
         //文件被删除
         index.remove(file);
diff --git a/src/commands/restore.rs b/src/commands/restore.rs
index abf8cd1..309759e 100644
--- a/src/commands/restore.rs
+++ b/src/commands/restore.rs
@@ -4,6 +4,7 @@ use std::{
     path::PathBuf,
 };
 
+use crate::utils::path_ext::PathExt;
 use crate::{
     models::*,
     utils::{store, util},
@@ -23,7 +24,7 @@ fn get_worktree_deleted_files_in_filters(
         .iter()
         .filter(|(path, _)| {
             assert!(path.is_absolute()); //
-            !path.exists() && util::include_in_paths(path, filters)
+            !path.exists() && path.include_in(filters)
         })
         .map(|(path, _)| path.clone())
         .collect() //HashSet自动去重
@@ -39,7 +40,7 @@ fn get_index_deleted_files_in_filters(
         .iter()
         .filter(|(path, _)| {
             assert!(path.is_absolute());
-            !index.contains(path) && util::include_in_paths(path, filters)
+            !index.contains(path) && path.include_in(filters)
         })
         .map(|(path, _)| path.clone())
         .collect() //HashSet自动去重
@@ -58,7 +59,7 @@ fn preprocess_filters(filters: Option<&Vec<PathBuf>>) -> Vec<PathBuf> {
 fn preprocess_blobs(blobs: &Vec<(PathBuf, Hash)>) -> HashMap<PathBuf, Hash> {
     blobs // 转为绝对路径 //TODO tree改变路径表示方式后，这里需要修改
         .iter()
-        .map(|(path, hash)| (util::to_workdir_absolute_path(path), hash.clone()))
+        .map(|(path, hash)| (path.to_absolute_workdir(), hash.clone()))
         .collect() //to HashMap
 }
 
diff --git a/src/commands/status.rs b/src/commands/status.rs
index 9ea6a3a..62e4595 100644
--- a/src/commands/status.rs
+++ b/src/commands/status.rs
@@ -1,4 +1,5 @@
 use crate::models::head;
+use crate::utils::path_ext::PathExt;
 use crate::{
     models::{Blob, Commit, Index},
     utils::util,
@@ -47,7 +48,7 @@ impl Changes {
         [&mut change.new, &mut change.modified, &mut change.deleted]
             .iter_mut()
             .for_each(|paths| {
-                **paths = util::map(&**paths, |p| util::to_workdir_absolute_path(p));
+                **paths = util::map(&**paths, |p| p.to_absolute_workdir());
             });
         change
     }
@@ -80,7 +81,7 @@ pub fn changes_to_be_committed() -> Changes {
     let tracked_files = index
         .get_tracked_files()
         .iter()
-        .map(|f| util::to_workdir_relative_path(f))
+        .map(|f| f.to_relative_workdir())
         .collect::<Vec<PathBuf>>();
     if head_hash == "" {
         // 初始提交
@@ -96,7 +97,7 @@ pub fn changes_to_be_committed() -> Changes {
     for (tree_file, blob_hash) in tree_files.iter() {
         let index_file = index_files.iter().find(|&f| f == tree_file);
         if let Some(index_file) = index_file {
-            let index_path = util::to_workdir_absolute_path(index_file);
+            let index_path = index_file.to_absolute_workdir();
             if !index.verify_hash(&index_path, blob_hash) {
                 change.modified.push(tree_file.clone());
             }
@@ -119,12 +120,12 @@ pub fn changes_to_be_staged() -> Changes {
     let index = Index::get_instance();
     for file in index.get_tracked_files() {
         if !file.exists() {
-            change.deleted.push(util::to_workdir_relative_path(&file));
+            change.deleted.push(file.to_relative_workdir());
         } else if index.is_modified(&file) {
             // 若文件元数据被修改，才需要比较暂存区与文件的hash来判别内容修改
             let dry_blob = Blob::dry_new(util::read_workfile(&file));
             if !index.verify_hash(&file, &dry_blob.get_hash()) {
-                change.modified.push(util::to_workdir_relative_path(&file));
+                change.modified.push(file.to_relative_workdir());
             }
         }
     }
@@ -132,7 +133,7 @@ pub fn changes_to_be_staged() -> Changes {
     for file in files {
         if !index.tracked(&file) {
             //文件未被跟踪
-            change.new.push(util::to_workdir_relative_path(&file));
+            change.new.push(file.to_relative_workdir());
         }
     }
     change
diff --git a/src/models/index.rs b/src/models/index.rs
index f0b2aee..84ddcae 100644
--- a/src/models/index.rs
+++ b/src/models/index.rs
@@ -1,3 +1,4 @@
+use crate::utils::path_ext::PathExt;
 use crate::{models::*, utils::util};
 use once_cell::unsync::Lazy;
 use serde::{Deserialize, Serialize};
@@ -76,7 +77,7 @@ impl Index {
 
     /// 预处理路径，统一形式为绝对路径
     fn preprocess(path: &Path) -> PathBuf {
-        util::get_absolute_path(&path)
+        path.to_absolute()
     }
 
     // 添加文件
diff --git a/src/models/tree.rs b/src/models/tree.rs
index 090fafc..f5e7d0c 100644
--- a/src/models/tree.rs
+++ b/src/models/tree.rs
@@ -2,6 +2,7 @@ use std::{collections::HashSet, path::PathBuf};
 
 use serde::{Deserialize, Serialize};
 
+use crate::utils::PathExt;
 use crate::utils::{store, util};
 
 use super::{Hash, Index};
@@ -41,7 +42,7 @@ fn store_path_to_tree(index: &Index, current_root: PathBuf) -> Tree {
     let path_entries: Vec<PathBuf> = index
         .get_tracked_files()
         .iter()
-        .map(|file| util::to_workdir_relative_path(file))
+        .map(|file| file.to_relative_workdir())
         .filter(|path| path.starts_with(&current_root))
         .collect();
     for path in path_entries.iter() {
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 381e0a1..6836d24 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -1,3 +1,5 @@
+pub mod path_ext;
+pub use path_ext::PathExt;
 pub mod store;
 pub mod test;
 pub mod util;
diff --git a/src/utils/path_ext.rs b/src/utils/path_ext.rs
new file mode 100644
index 0000000..a4242bb
--- /dev/null
+++ b/src/utils/path_ext.rs
@@ -0,0 +1,56 @@
+use crate::utils::util;
+use std::path::{Path, PathBuf};
+
+/**
+Path的扩展 基于util 为了解耦，不要再util中使用PathExt
+ */
+pub trait PathExt {
+    fn to_absolute(&self) -> PathBuf;
+    fn to_absolute_workdir(&self) -> PathBuf;
+    fn to_relative(&self) -> PathBuf;
+    fn to_relative_workdir(&self) -> PathBuf;
+    fn is_sub_to(&self, parent: &PathBuf) -> bool;
+    fn include_in<T, U>(&self, paths: U) -> bool
+    where
+        T: AsRef<Path>,
+        U: IntoIterator<Item = T>;
+}
+/*
+在 Rust 中，当你调用一个方法时，Rust 会尝试自动解引用和自动引用（auto-deref and auto-ref）来匹配方法签名。
+如果有一个为 Path 实现的方法，你可以在 PathBuf、&PathBuf、&&PathBuf 等上调用这个方法，Rust 会自动进行必要的解引用。
+ */
+impl PathExt for Path {
+    /// 转换为绝对路径
+    fn to_absolute(&self) -> PathBuf {
+        util::get_absolute_path(&self)
+    }
+
+    /// 转换为绝对路径（from workdir相对路径）
+    fn to_absolute_workdir(&self) -> PathBuf {
+        util::to_workdir_absolute_path(&self)
+    }
+
+    /// 转换为相对路径（to cur_dir）
+    fn to_relative(&self) -> PathBuf {
+        util::get_relative_path(&self)
+    }
+
+    /// 转换为相对路径（to workdir）
+    fn to_relative_workdir(&self) -> PathBuf {
+        util::to_workdir_relative_path(&self)
+    }
+
+    /// 从字符串角度判断path是否是parent的子路径（不检测存在性)
+    fn is_sub_to(&self, parent: &PathBuf) -> bool {
+        util::is_sub_path(&self, parent)
+    }
+
+    /// 判断是否在paths中（包括子目录），不检查存在
+    fn include_in<T, U>(&self, paths: U) -> bool
+    where
+        T: AsRef<Path>,
+        U: IntoIterator<Item = T>,
+    {
+        util::include_in_paths(&self, paths)
+    }
+}
diff --git a/src/utils/test.rs b/src/utils/test.rs
index 0223354..30a0867 100644
--- a/src/utils/test.rs
+++ b/src/utils/test.rs
@@ -8,6 +8,7 @@ use std::{
 };
 
 use crate::models::Index;
+use crate::utils::PathExt;
 
 // 执行测试的储存库
 use super::util;
@@ -114,7 +115,7 @@ pub fn ensure_no_file(path: &Path) {
 /** 列出子文件夹 */
 pub fn list_subdir(path: &Path) -> io::Result<Vec<PathBuf>> {
     let mut files = Vec::new();
-    let path = util::get_absolute_path(path);
+    let path = path.to_absolute();
     if path.is_dir() {
         for entry in fs::read_dir(path)? {
             let entry = entry?;