diff --git a/src/background.rs b/src/background.rs
index 61c94cd..872f533 100644
--- a/src/background.rs
+++ b/src/background.rs
@@ -2,10 +2,10 @@ use std::sync::Arc;
 
 use tokio::{sync::RwLock, time::Duration};
 
-use crate::{Tracker, TRACKER_NODES};
+use crate::{project::Project, Tracker, TRACKER_NODES};
 
 impl Tracker {
-    pub fn start_select_tracker_background(api_base: Arc<RwLock<&'static str>>) {
+    pub fn select_tracker_background(api_base: Arc<RwLock<&'static str>>) {
         tokio::spawn(async move {
             loop {
                 tokio::time::sleep(Duration::from_secs(60)).await;
diff --git a/src/lib.rs b/src/lib.rs
index 0c87c1e..4dd829d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,10 +4,10 @@ use tokio::sync::RwLock;
 use tokio::time::Duration;
 
 pub mod archivist;
+pub mod background;
 pub mod item;
 pub mod project;
 pub mod task;
-pub mod background;
 
 const TRACKER_NODES: [&str; 7] = [
     // "http://localhost:8080", // 测试环境
@@ -28,7 +28,7 @@ pub struct Tracker {
     http_client: reqwest::Client,
     client_version: String,
     archivist: String,
-    project: Option<Project>,
+    project: Arc<RwLock<Option<Project>>>,
 }
 
 impl Tracker {
@@ -38,9 +38,9 @@ impl Tracker {
         archivist: String,
     ) -> Result<Self, Box<dyn std::error::Error>> {
         let api_base = Arc::new(RwLock::new(TRACKER_NODES[1]));
-        Self::start_select_tracker_background(Arc::clone(&api_base));
-        Ok(Tracker {
-            api_base,
+        let project = Arc::new(RwLock::new(None));
+        let t = Tracker {
+            api_base: Arc::clone(&api_base),
             api_version: "v1",
             project_id: project_id,
             http_client: reqwest::Client::builder()
@@ -48,8 +48,11 @@ impl Tracker {
                 .build()?,
             client_version,
             archivist,
-            project: None,
-        })
+            project,
+        };
+        Self::select_tracker_background(api_base);
+        t.update_project_background();
+        Ok(t)
     }
 }
 
diff --git a/src/project.rs b/src/project.rs
index a290d45..61aa1a6 100644
--- a/src/project.rs
+++ b/src/project.rs
@@ -42,7 +42,7 @@ pub struct Project {
 }
 
 impl Tracker {
-    pub async fn fetch_project(&self) -> Result<Project, Box<dyn std::error::Error>> {
+    async fn fetch_project(&self) -> Result<Project, Box<dyn std::error::Error>> {
         println!("fetch_project... {}", self.project_id);
         let api_base = *self.api_base.read().await;
 
@@ -51,15 +51,22 @@ impl Tracker {
             api_base, self.api_version, self.project_id
         );
         let res = self.http_client.post(&url).send().await?;
-        // parse response as json
         let project: Project = serde_json::from_str(&res.text().await?)?;
         Ok(project)
     }
 
-    pub async fn get_project(&mut self) -> &Project {
-        if self.project.is_none() {
-            self.project = Some(self.fetch_project().await.unwrap());
-        }
-        self.project.as_ref().unwrap()
-    } // if let 会转移所有权
+    pub async fn update_project(&self) {
+        let project = self.project.clone();
+        let new_project = self.fetch_project().await.unwrap();
+        let mut write_guard = project.write().await;
+        *write_guard = Some(new_project);
+    }
+
+    // pub async fn get_project(&mut self) -> &Project {
+    //     if self.project.read().await.is_none() {
+    //         let project = self.fetch_project().await.unwrap();
+    //         *self.project.write().await = Some(project);
+    //     }
+    //     self.project.read().await.as_ref().unwrap()
+    //} if let 会转移所有权
 }