diff --git a/git-rs b/git-rs
deleted file mode 160000
index 5f3bb36..0000000
--- a/git-rs
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 5f3bb36574167640943af9b73e9adb65fd14f4ac
diff --git a/src/commands/add.rs b/src/commands/add.rs
index 67c16b9..edba0d1 100644
--- a/src/commands/add.rs
+++ b/src/commands/add.rs
@@ -1,12 +1,13 @@
 use std::env;
 use std::path::{Path, PathBuf};
 use colored::Colorize;
-use crate::models::index::Index;
-use crate::utils::util::{check_repo_exist, get_working_dir, list_files};
+use crate::models::blob::Blob;
+use crate::models::index::{FileMetaData, Index};
+use crate::utils::util::{check_repo_exist, get_file_mode, get_relative_path, get_working_dir, list_files};
 
 pub fn add(files: Vec<String>, all: bool, mut update: bool) {
     check_repo_exist();
-    let index = Index::new();
+    let mut index = Index::new();
     let mut dot = files.contains(&".".to_string());
 
     let mut files: Vec<PathBuf> = files.into_iter().map(PathBuf::from).collect();
@@ -33,13 +34,30 @@ pub fn add(files: Vec<String>, all: bool, mut update: bool) {
                 index.contains(file)
             });
         }
+
+        files.extend(index.get_deleted_files()); //包含已删除的文件
     }
 
-    for file in files {
-        add_a_file(file.as_path(), &index);
+    for file in &files {
+        add_a_file(file, &mut index);
     }
 }
 
-fn add_a_file(file: &Path, index: &Index) {
-    println!("add a file: {:?}", file);
+fn add_a_file(file: &Path, index: &mut Index) {
+    println!("add a file: {}", get_relative_path(file, get_working_dir().unwrap()).display());
+    if !file.exists() { //文件被删除
+        index.remove(file);
+    } else if !index.contains(file) { //文件未被跟踪
+        let blob = Blob::new(file);
+        let meta = file.metadata().unwrap();
+        index.add(file.to_path_buf(), FileMetaData{
+            hash: blob.get_hash(),
+            size: meta.len(),
+            created_time: meta.created().unwrap(),
+            modified_time: meta.modified().unwrap(),
+            mode: get_file_mode(file)
+        });
+    } else { //文件已被跟踪，可能被修改
+
+    }
 }
\ No newline at end of file
diff --git a/src/models/blob.rs b/src/models/blob.rs
index dd5c452..14dc96a 100644
--- a/src/models/blob.rs
+++ b/src/models/blob.rs
@@ -1,9 +1,25 @@
+use std::fs;
+use std::path::Path;
 use crate::models::object::Hash;
-/*Blob
-* Blob是git中最基本的对象，他储存一份文件的内容，并使用hash作为标识符。
+use crate::utils::util::calc_hash;
+
+/**
+    Blob
+Blob是git中最基本的对象，他储存一份文件的内容，并使用hash作为标识符。
 */
 #[derive(Debug, Clone)]
 pub struct Blob {
     hash: Hash,
     data: String,
 }
+
+impl Blob {
+    pub fn new(file: &Path) -> Blob {
+        let data = fs::read_to_string(file).unwrap();
+        let hash = calc_hash(&data);
+        Blob { hash, data }
+    }
+    pub fn get_hash(&self) -> String {
+        self.hash.clone()
+    }
+}
\ No newline at end of file
diff --git a/src/models/index.rs b/src/models/index.rs
index 4d41f1d..916d62a 100644
--- a/src/models/index.rs
+++ b/src/models/index.rs
@@ -4,21 +4,23 @@ use std::path::{Path, PathBuf};
 use std::time::SystemTime;
 use serde::{Deserialize, Serialize};
 use crate::models::object::Hash;
+use crate::utils::util::get_working_dir;
 
 // 文件元数据结构
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct FileMetaData {
-    hash: Hash,              // SHA-1 哈希值
-    size: u64,                 // 文件大小
-    created_time: SystemTime,  // 创建时间
-    modified_time: SystemTime, // 修改时间
-    mode: String,                 // 文件模式
+    pub hash: Hash,              // SHA-1 哈希值
+    pub size: u64,                 // 文件大小
+    pub created_time: SystemTime,  // 创建时间
+    pub modified_time: SystemTime, // 修改时间
+    pub mode: String,                 // 文件模式
 }
 
 // 索引数据结构
 #[derive(Serialize, Deserialize, Debug, Default)]
 pub struct Index {
     entries: HashMap<PathBuf, FileMetaData>,
+    working_dir: PathBuf,
 }
 
 impl Index {
@@ -26,19 +28,20 @@ impl Index {
     pub(crate) fn new() -> Index {
         let mut index = Index {
             entries: HashMap::new(),
+            working_dir: get_working_dir().unwrap()
         };
         index.load();
         return index;
     }
 
     // 添加文件
-    fn add(&mut self, path: PathBuf, data: FileMetaData) {
+    pub fn add(&mut self, path: PathBuf, data: FileMetaData) {
         self.entries.insert(path, data);
     }
 
     // 删除文件
-    fn remove(&mut self, path: PathBuf) {
-        self.entries.remove(&path);
+    pub fn remove(&mut self, path: &Path) {
+        self.entries.remove(path);
     }
 
     // 获取文件元数据
@@ -55,12 +58,23 @@ impl Index {
         self.entries.contains_key(path)
     }
 
+    /// 获取所有已删除的文件
+    pub fn get_deleted_files(&self) -> Vec<PathBuf> {
+        let mut files = Vec::new();
+        self.entries.keys().for_each(|file| {
+            if !file.exists() {
+                files.push(file.clone());
+            }
+        });
+        files
+    }
+
     fn load(&mut self) {
 
     }
 
     /// 二进制序列化
-    fn save(&self) {
+    fn save(&self) { //要先转化为相对路径
         let ser = serde_json::to_string(&self).unwrap();
         println!("{}", ser);
     }
diff --git a/src/utils/util.rs b/src/utils/util.rs
index be84d92..749bafe 100644
--- a/src/utils/util.rs
+++ b/src/utils/util.rs
@@ -26,18 +26,18 @@ pub fn check_repo_exist() {
     }
 }
 
-pub fn get_storage_path() -> Result<PathBuf, std::io::Error> {
+pub fn get_storage_path() -> Result<PathBuf, io::Error> {
     /*递归获取储存库 */
     let mut current_dir = std::env::current_dir()?;
     loop {
         let mut git_path = current_dir.clone();
         git_path.push(ROOT_DIR);
         if git_path.exists() {
-            return  Ok(git_path);
+            return Ok(git_path);
         }
         if !current_dir.pop() {
-            return Err(std::io::Error::new(
-                std::io::ErrorKind::NotFound,
+            return Err(io::Error::new(
+                io::ErrorKind::NotFound,
                 "Not a git repository",
             ));
         }
@@ -46,7 +46,7 @@ pub fn get_storage_path() -> Result<PathBuf, std::io::Error> {
 
 /// 获取项目工作区目录, 也就是.mit的父目录
 pub fn get_working_dir() -> Option<PathBuf> {
-    if let Some(path) = PathBuf::from(get_storage_path().unwrap()).parent() {
+    if let Some(path) = get_storage_path().unwrap().parent() {
         Some(path.to_path_buf())
     } else {
         None
@@ -81,6 +81,38 @@ pub fn list_files(path: &Path) -> io::Result<Vec<PathBuf>> {
     Ok(files)
 }
 
+pub fn get_relative_path(path: &Path, dir: PathBuf) -> PathBuf {
+    let relative_path = path.strip_prefix(dir).unwrap();
+    relative_path.to_path_buf()
+}
+
+fn is_executable(path: &str) -> bool {
+    #[cfg(not(target_os = "windows"))]
+    {
+        use std::os::unix::fs::PermissionsExt;
+        fs::metadata(path)
+            .map(|metadata| metadata.permissions().mode() & 0o111 != 0)
+            .unwrap_or(false)
+    }
+
+    #[cfg(windows)]
+    {
+        let path = Path::new(path);
+        match path.extension().and_then(|s| s.to_str()) {
+            Some(ext) => ext.eq_ignore_ascii_case("exe") || ext.eq_ignore_ascii_case("bat"),
+            None => false,
+        }
+    }
+}
+
+pub fn get_file_mode(path: &Path) -> String {
+    if is_executable(path.to_str().unwrap()) {
+        "100755".to_string()
+    } else {
+        "100644".to_string()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;