diff --git a/client-app/src-tauri/src/commands.rs b/client-app/src-tauri/src/commands.rs
index 60ac58e04e..18523a06b2 100644
--- a/client-app/src-tauri/src/commands.rs
+++ b/client-app/src-tauri/src/commands.rs
@@ -16,6 +16,7 @@ pub fn invoke_handler() -> impl Fn(tauri::Invoke) + Send + Sync + 'static {
     get_workspaces,
     get_workspace,
     create_user,
+    get_user,
     create_doc,
     get_doc,
     put_blob,
diff --git a/client-app/src-tauri/src/commands/user.rs b/client-app/src-tauri/src/commands/user.rs
index c754e07aea..d18ede1617 100644
--- a/client-app/src-tauri/src/commands/user.rs
+++ b/client-app/src-tauri/src/commands/user.rs
@@ -1,5 +1,5 @@
 use cloud_database::{CreateUser, User};
-use ipc_types::document::CreateDocumentParameter;
+use ipc_types::{document::CreateDocumentParameter, user::GetUserParameters};
 
 use crate::state::AppState;
 
@@ -18,7 +18,7 @@ pub async fn create_user<'s>(
     .metadata_db
     .create_user(parameters.clone())
     .await;
-  match new_user_result{
+  match new_user_result {
     Ok(new_user_option) => match new_user_option {
       Some((new_user, new_workspace)) => {
         // a new private workspace is created, we have to create a yDoc for it
@@ -38,3 +38,16 @@ pub async fn create_user<'s>(
     Err(error_message) => Err(error_message.to_string()),
   }
 }
+
+#[tauri::command]
+/// get the only one user in local sqlite
+pub async fn get_user<'s>(
+  state: tauri::State<'s, AppState>,
+  parameters: GetUserParameters,
+) -> Result<User, String> {
+  let db = &state.0.lock().await.metadata_db;
+  match db.get_user_by_email(&parameters.email).await.ok().unwrap() {
+    Some(user) => Ok(user),
+    None => Err("User not found".to_string()),
+  }
+}
diff --git a/client-app/src-tauri/types/src/user.rs b/client-app/src-tauri/types/src/user.rs
index 40b90751aa..63d7055d22 100644
--- a/client-app/src-tauri/types/src/user.rs
+++ b/client-app/src-tauri/types/src/user.rs
@@ -2,8 +2,14 @@ use cloud_database::{CreateUser, User};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
+#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
+pub struct GetUserParameters {
+  pub email: String,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
 pub enum IUserParameters {
   CreateUser(CreateUser),
   User(User),
+  GetUserParameters(GetUserParameters),
 }
diff --git a/client-app/src-tauri/types/src/workspace.rs b/client-app/src-tauri/types/src/workspace.rs
index 2aca972bba..88b92477c4 100644
--- a/client-app/src-tauri/types/src/workspace.rs
+++ b/client-app/src-tauri/types/src/workspace.rs
@@ -14,8 +14,7 @@ pub struct CreateWorkspace {
 
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
 pub struct GetWorkspaces {
-  // TODO: make all id string, on Octobase side, and rewrite all related tests
-  pub user_id: i32,
+  pub user_id: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
diff --git a/packages/data-center/src/provider/tauri-ipc/__tests__/mock-apis.ts b/packages/data-center/src/provider/tauri-ipc/__tests__/mock-apis.ts
index 9a17a4f161..f426a5c7c3 100644
--- a/packages/data-center/src/provider/tauri-ipc/__tests__/mock-apis.ts
+++ b/packages/data-center/src/provider/tauri-ipc/__tests__/mock-apis.ts
@@ -61,7 +61,7 @@ export const getBlob = async (parameters: GetBlob): Promise<number[]> =>
 export const createUser = async (parameters: CreateUser): Promise<User> =>
   await {
     created_at: 0,
-    id: 1,
+    id: '1',
     email: 'xxx@xxx.xxx',
     name: 'xxx',
   };
diff --git a/packages/data-center/src/provider/tauri-ipc/index.ts b/packages/data-center/src/provider/tauri-ipc/index.ts
index 024d39c0f1..1108dddbaf 100644
--- a/packages/data-center/src/provider/tauri-ipc/index.ts
+++ b/packages/data-center/src/provider/tauri-ipc/index.ts
@@ -21,10 +21,11 @@ import { applyUpdate } from '../../utils/index.js';
  */
 export class TauriIPCProvider extends LocalProvider {
   static id = 'tauri-ipc';
+  static defaultUserEmail = 'xxx@xx.xx';
   /**
    * // TODO: We only have one user in this version of app client. But may support switch user later.
    */
-  #defaultUserID = 1;
+  #userID?: string;
   #ipc: IPCMethodsType | undefined;
 
   constructor(params: ProviderConstructorParams) {
@@ -37,18 +38,25 @@ export class TauriIPCProvider extends LocalProvider {
     } else {
       this.#ipc = await import('./ipc/methods.js');
     }
-    // we create a default user if we don't have one.
     try {
-      const user = await this.#ipc?.createUser({
-        email: 'xxx@xx.xx',
-        name: 'xxx',
-        password: 'xxx',
-        avatar_url: '',
+      const user = await this.#ipc?.getUser({
+        email: TauriIPCProvider.defaultUserEmail,
       });
-      this.#defaultUserID = user.id;
+      this.#userID = user.id;
     } catch (error) {
-      // maybe user existed, which can be omited
-      console.error(error);
+      // maybe user not existed, we create a default user if we don't have one.
+      try {
+        const user = await this.#ipc?.createUser({
+          email: TauriIPCProvider.defaultUserEmail,
+          name: 'xxx',
+          password: 'xxx',
+          avatar_url: '',
+        });
+        this.#userID = user.id;
+      } catch (error) {
+        // maybe user existed, which can be omited
+        console.error(error);
+      }
     }
   }
 
@@ -116,7 +124,7 @@ export class TauriIPCProvider extends LocalProvider {
     const { id } = await this.#ipc.createWorkspace({
       name: meta.name,
       // TODO: get userID here
-      user_id: this.#defaultUserID,
+      user_id: this.#userID,
     });
 
     const workspaceUnit = await createWorkspaceUnit({
@@ -144,7 +152,7 @@ export class TauriIPCProvider extends LocalProvider {
   override async loadWorkspaces(): Promise<WorkspaceUnit[]> {
     assert(this.#ipc);
     const { workspaces } = await this.#ipc.getWorkspaces({
-      user_id: this.#defaultUserID,
+      user_id: this.#userID,
     });
     const workspaceUnits = await Promise.all(
       workspaces.map((meta: WorkspaceWithPermission) => {
diff --git a/packages/data-center/src/provider/tauri-ipc/ipc/methods.ts b/packages/data-center/src/provider/tauri-ipc/ipc/methods.ts
index 6bb4f92c92..65cda5092e 100644
--- a/packages/data-center/src/provider/tauri-ipc/ipc/methods.ts
+++ b/packages/data-center/src/provider/tauri-ipc/ipc/methods.ts
@@ -14,7 +14,7 @@ import {
   User,
 } from './types/workspace';
 import { GetBlob, PutBlob } from './types/blob';
-import { CreateUser } from './types/user';
+import { CreateUser, GetUserParameters } from './types/user';
 
 export interface IPCMethodsType {
   updateYDocument: typeof updateYDocument;
@@ -25,6 +25,7 @@ export interface IPCMethodsType {
   putBlob: typeof putBlob;
   getBlob: typeof getBlob;
   createUser: typeof createUser;
+  getUser: typeof getUser;
 }
 
 export const updateYDocument = async (parameters: YDocumentUpdate) =>
@@ -70,3 +71,8 @@ export const createUser = async (parameters: CreateUser) =>
   await invoke<User>('create_user', {
     parameters,
   });
+
+export const getUser = async (parameters: GetUserParameters) =>
+  await invoke<User>('get_user', {
+    parameters,
+  });
diff --git a/packages/data-center/src/provider/tauri-ipc/ipc/types/user.json b/packages/data-center/src/provider/tauri-ipc/ipc/types/user.json
index ae91d63e0f..9b3f54ec4f 100644
--- a/packages/data-center/src/provider/tauri-ipc/ipc/types/user.json
+++ b/packages/data-center/src/provider/tauri-ipc/ipc/types/user.json
@@ -21,6 +21,16 @@
         }
       },
       "additionalProperties": false
+    },
+    {
+      "type": "object",
+      "required": ["GetUserParameters"],
+      "properties": {
+        "GetUserParameters": {
+          "$ref": "#/definitions/GetUserParameters"
+        }
+      },
+      "additionalProperties": false
     }
   ],
   "definitions": {
@@ -42,6 +52,15 @@
         }
       }
     },
+    "GetUserParameters": {
+      "type": "object",
+      "required": ["email"],
+      "properties": {
+        "email": {
+          "type": "string"
+        }
+      }
+    },
     "User": {
       "type": "object",
       "required": ["created_at", "email", "id", "name"],
@@ -57,8 +76,7 @@
           "type": "string"
         },
         "id": {
-          "type": "integer",
-          "format": "int32"
+          "type": "string"
         },
         "name": {
           "type": "string"
diff --git a/packages/data-center/src/provider/tauri-ipc/ipc/types/user.ts b/packages/data-center/src/provider/tauri-ipc/ipc/types/user.ts
index 818b9d20b9..b03c418a64 100644
--- a/packages/data-center/src/provider/tauri-ipc/ipc/types/user.ts
+++ b/packages/data-center/src/provider/tauri-ipc/ipc/types/user.ts
@@ -10,6 +10,9 @@ export type IUserParameters =
     }
   | {
       User: User;
+    }
+  | {
+      GetUserParameters: GetUserParameters;
     };
 
 export interface CreateUser {
@@ -23,7 +26,11 @@ export interface User {
   avatar_url?: string | null;
   created_at: number;
   email: string;
-  id: number;
+  id: string;
   name: string;
   [k: string]: unknown;
 }
+export interface GetUserParameters {
+  email: string;
+  [k: string]: unknown;
+}
diff --git a/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.json b/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.json
index 26afd9e32d..9bfe0226ac 100644
--- a/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.json
+++ b/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.json
@@ -123,8 +123,7 @@
       "required": ["user_id"],
       "properties": {
         "user_id": {
-          "type": "integer",
-          "format": "int32"
+          "type": "string"
         }
       }
     },
@@ -172,8 +171,7 @@
           "type": "string"
         },
         "id": {
-          "type": "integer",
-          "format": "int32"
+          "type": "string"
         },
         "name": {
           "type": "string"
diff --git a/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.ts b/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.ts
index 138af13c95..d7bacee60b 100644
--- a/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.ts
+++ b/packages/data-center/src/provider/tauri-ipc/ipc/types/workspace.ts
@@ -42,7 +42,7 @@ export interface GetWorkspace {
   [k: string]: unknown;
 }
 export interface GetWorkspaces {
-  user_id: number;
+  user_id: string;
   [k: string]: unknown;
 }
 export interface GetWorkspaceResult {
@@ -62,7 +62,7 @@ export interface User {
   avatar_url?: string | null;
   created_at: number;
   email: string;
-  id: number;
+  id: string;
   name: string;
   [k: string]: unknown;
 }