diff --git a/src/user/api.rs b/src/user/api.rs
index 83e9da8..d76cd38 100644
--- a/src/user/api.rs
+++ b/src/user/api.rs
@@ -2,7 +2,7 @@ use poem::web::Data;
 use poem_openapi::{param::Path, payload::Json, OpenApi};
 
 use slab::Slab;
-use tokio::sync::Mutex;
+use tokio::sync::RwLock;
 use tracing::info;
 
 use crate::CACHE;
@@ -11,7 +11,7 @@ use super::*;
 
 #[derive(Default)]
 pub(crate) struct Api {
-    users: Mutex<Slab<User>>,
+    users: RwLock<Slab<User>>,
 }
 
 #[OpenApi]
@@ -26,7 +26,7 @@ impl Api {
         let rt = m_guard.get(&"token".to_string()).unwrap();
         info!("refresh_token is {}", rt);
 
-        let mut users = self.users.lock().await;
+        let mut users = self.users.write().await;
         let id = users.insert(user.0) as i64;
         CreateUserResponse::Ok(Json(id))
     }
@@ -34,7 +34,7 @@ impl Api {
     /// Find user by id
     #[oai(path = "/users/:user_id", method = "get", tag = "ApiTags::User")]
     async fn find_user(&self, user_id: Path<i64>) -> FindUserResponse {
-        let users = self.users.lock().await;
+        let users = self.users.read().await;
         match users.get(user_id.0 as usize) {
             Some(user) => FindUserResponse::Ok(Json(user.clone())),
             None => FindUserResponse::NotFound,
@@ -44,7 +44,7 @@ impl Api {
     /// Delete user by id
     #[oai(path = "/users/:user_id", method = "delete", tag = "ApiTags::User")]
     async fn delete_user(&self, user_id: Path<i64>) -> DeleteUserResponse {
-        let mut users = self.users.lock().await;
+        let mut users = self.users.write().await;
         let user_id = user_id.0 as usize;
         if users.contains(user_id) {
             users.remove(user_id);
@@ -57,7 +57,7 @@ impl Api {
     /// Update user by id
     #[oai(path = "/users/:user_id", method = "put", tag = "ApiTags::User")]
     async fn put_user(&self, user_id: Path<i64>, update: Json<UpdateUser>) -> UpdateUserResponse {
-        let mut users = self.users.lock().await;
+        let mut users = self.users.write().await;
         match users.get_mut(user_id.0 as usize) {
             Some(user) => {
                 if let Some(name) = update.0.name {