diff --git a/src/commands/restore.rs b/src/commands/restore.rs
index 34ad2a1..6fd6e68 100644
--- a/src/commands/restore.rs
+++ b/src/commands/restore.rs
@@ -15,8 +15,8 @@ use crate::{
     utils::{util, util::get_working_dir},
 };
 
-/// 统计[工作区]中的dirs文件夹中，相对于target_blobs已删除的文件
-fn get_worktree_deleted_files_in_paths(
+/// 统计[工作区]中相对于target_blobs已删除的文件（根据filters进行过滤）
+fn get_worktree_deleted_files_in_filters(
     filters: &Vec<PathBuf>,
     target_blobs: &HashMap<PathBuf, Hash>,
 ) -> HashSet<PathBuf> {
@@ -24,22 +24,14 @@ fn get_worktree_deleted_files_in_paths(
         .iter()
         .filter(|(path, _)| {
             assert!(path.is_absolute()); //
-            if !path.exists() {
-                for filter in filters {
-                    if util::is_parent_dir(path, filter) {
-                        //需要包含在指定dir内
-                        return true;
-                    }
-                }
-            }
-            false
+            !path.exists() && util::include_in_paths(path, filters)
         })
         .map(|(path, _)| path.clone())
         .collect() //HashSet自动去重
 }
 
-/// 统计[暂存区index]中相对于target_blobs已删除的文件，且包含在指定dirs内
-fn get_index_deleted_files_in_paths(
+/// 统计[暂存区index]中相对于target_blobs已删除的文件（根据filters进行过滤）
+fn get_index_deleted_files_in_filters(
     index: &Index,
     filters: &Vec<PathBuf>,
     target_blobs: &HashMap<PathBuf, Hash>,
@@ -47,17 +39,8 @@ fn get_index_deleted_files_in_paths(
     target_blobs //统计index中相对target已删除的文件，且包含在指定dir内
         .iter()
         .filter(|(path, _)| {
-            assert!(path.is_absolute()); //
-            if !index.contains(path) {
-                //index中不存在
-                for filter in filters {
-                    if util::is_parent_dir(path, filter) {
-                        //需要包含在指定dir内
-                        return true;
-                    }
-                }
-            }
-            false
+            assert!(path.is_absolute());
+            !index.contains(path) && util::include_in_paths(path, filters)
         })
         .map(|(path, _)| path.clone())
         .collect() //HashSet自动去重
@@ -85,16 +68,16 @@ pub fn restore_worktree(filter: Option<&Vec<PathBuf>>, target_blobs: &Vec<(PathB
     let input_paths = preprocess_filters(filter); //预处理filter 将None转化为workdir
     let target_blobs = preprocess_blobs(target_blobs); //预处理target_blobs 转化为绝对路径HashMap
 
-    let deleted_files = get_worktree_deleted_files_in_paths(&input_paths, &target_blobs); //统计所有目录中已删除的文件
+    let deleted_files = get_worktree_deleted_files_in_filters(&input_paths, &target_blobs); //统计所有目录中已删除的文件
 
-    let mut file_paths = util::integrate_paths(&input_paths); //整合存在的文件（绝对路径）
+    let mut file_paths = util::integrate_paths(&input_paths); //根据用户输入整合存在的文件（绝对路径）
     file_paths.extend(deleted_files); //已删除的文件
 
     let index = Index::new();
     let store = Store::new();
 
     for path in &file_paths {
-        assert!(path.is_absolute()); // 绝对路径且不是目录
+        assert!(path.is_absolute()); // 绝对路径
         if !path.exists() {
             //文件不存在于workdir
             if target_blobs.contains_key(path) {
@@ -129,23 +112,16 @@ pub fn restore_index(filter: Option<&Vec<PathBuf>>, target_blobs: &Vec<(PathBuf,
     let target_blobs = preprocess_blobs(target_blobs); //预处理target_blobs 转化为绝对路径HashMap
 
     let mut index = Index::new();
-    let deleted_files_index = get_index_deleted_files_in_paths(&index, &input_paths, &target_blobs); //统计所有目录中已删除的文件
+    let deleted_files_index = get_index_deleted_files_in_filters(&index, &input_paths, &target_blobs); //统计所有目录中已删除的文件
+
+    //1.获取index中包含于input_path的文件（使用paths进行过滤）
+    let mut file_paths = util::filter_to_fit_paths(&index.get_tracked_files(), &input_paths);
 
-    let mut file_paths = HashSet::new();
-    // 1.获取index中包含于input_path的文件
-    for index_file in index.get_tracked_files() {
-        for path in &input_paths {
-            if util::is_parent_dir(&index_file, path) {
-                //需要包含在指定dir内
-                file_paths.insert(index_file.clone());
-            }
-        }
-    }
     // 2.补充index中已删除的文件（相较于target_blobs）
     file_paths.extend(deleted_files_index); //已删除的文件
 
     for path in &file_paths {
-        assert!(path.is_absolute()); // 绝对路径且不是目录
+        assert!(path.is_absolute()); // 绝对路径
         if !index.contains(path) {
             //文件不存在于index
             if target_blobs.contains_key(path) {
diff --git a/src/models/index.rs b/src/models/index.rs
index bc3e089..13b7d3f 100644
--- a/src/models/index.rs
+++ b/src/models/index.rs
@@ -112,7 +112,7 @@ impl Index {
     pub fn get_deleted_files(&self, dir: &Path) -> Vec<PathBuf> {
         let mut files = Vec::new();
         self.entries.keys().for_each(|file| {
-            if !file.exists() && util::is_parent_dir(file, dir) {
+            if !file.exists() && util::is_sub_path(file, dir) {
                 files.push(file.clone());
             }
         });
diff --git a/src/utils/util.rs b/src/utils/util.rs
index 953043f..4be729c 100644
--- a/src/utils/util.rs
+++ b/src/utils/util.rs
@@ -154,6 +154,39 @@ pub fn is_parent_dir(file: &Path, dir: &Path) -> bool {
     file.starts_with(dir)
 }
 
+/// 从字符串角度判断path是否是parent的子路径（不检测存在性) alias: [is_parent_dir]
+pub fn is_sub_path(path: &Path, parent: &Path) -> bool {
+    is_parent_dir(path, parent)
+}
+
+/// 判断文件是否在paths中（包括子目录），不检查存在性
+pub fn include_in_paths<T, U>(path: &Path, paths: U) -> bool
+where
+    T: AsRef<Path>,
+    U: IntoIterator<Item = T>,
+{
+    for p in paths {
+        if is_sub_path(path, p.as_ref()) {
+            return true;
+        }
+    }
+    false
+}
+
+/// 过滤列表中的元素，对.iter().filter().cloned().collect()的简化
+pub fn filter<T, F>(items: &Vec<T>, pred: F) -> Vec<T>
+where
+    T: Clone,
+    F: Fn(&T) -> bool,
+{
+    items.iter().filter(|item| pred(item)).cloned().collect()
+}
+
+/// 过滤列表中的元素，使其在paths中（包括子目录），不检查存在性
+pub fn filter_to_fit_paths(items: &Vec<PathBuf>, paths: &Vec<PathBuf>) -> HashSet<PathBuf> {
+    filter(items, |item| include_in_paths(item, paths)).into_iter().collect()
+}
+
 /// 检查文件是否在工作区内， 若不存在则false
 pub fn is_inside_workdir(file: &Path) -> bool {
     is_inside_dir(file, &get_working_dir().unwrap())