diff --git a/src/commands/add.rs b/src/commands/add.rs
index a43f1d6..bf920ab 100644
--- a/src/commands/add.rs
+++ b/src/commands/add.rs
@@ -42,8 +42,6 @@ pub fn add(files: Vec<String>, all: bool, mut update: bool) {
     for file in &files {
         add_a_file(file, &mut index);
     }
-
-    index.save();
 }
 
 fn add_a_file(file: &Path, index: &mut Index) {
diff --git a/src/commands/status.rs b/src/commands/status.rs
index 02f200e..5aab088 100644
--- a/src/commands/status.rs
+++ b/src/commands/status.rs
@@ -65,6 +65,10 @@ pub fn changes_to_be_committed() -> Changes {
     change
 }
 
+pub fn changes_to_be_staged() {
+    unimplemented!()
+}
+
 /** 分为两个部分
 1. unstaged: 暂存区与工作区比较
 2. staged to be committed: 暂存区与HEAD(最后一次Commit::Tree)比较，即上次的暂存区
diff --git a/src/models/index.rs b/src/models/index.rs
index 5ada61a..203375b 100644
--- a/src/models/index.rs
+++ b/src/models/index.rs
@@ -7,6 +7,7 @@ use std::collections::HashMap;
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::time::SystemTime;
+use colored::Colorize;
 
 // 文件元数据结构
 #[derive(Serialize, Deserialize, Debug, Clone)]
@@ -65,7 +66,8 @@ impl Index {
 
     // 删除文件
     pub fn remove(&mut self, path: &Path) {
-        self.entries.remove(path);
+        let path = Index::preprocess_path(&path);
+        self.entries.remove(&path);
     }
 
     // 获取文件元数据
@@ -172,6 +174,14 @@ impl Index {
     }
 }
 
+/// 析构自动保存
+impl Drop for Index {
+    fn drop(&mut self) {
+        self.save();
+        println!("{}", "Index auto saved".bright_green());
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;