diff --git a/app/common/PackageUtil.ts b/app/common/PackageUtil.ts
index b74587c49..c3e146e4f 100644
--- a/app/common/PackageUtil.ts
+++ b/app/common/PackageUtil.ts
@@ -27,6 +27,10 @@ export function cleanUserPrefix(username: string): string {
   return username.replace(/^.*:/, '');
 }
 
+export function getPrefixedName(prefix: string, username: string): string {
+  return prefix ? `${prefix}${username}` : username;
+}
+
 export async function calculateIntegrity(contentOrFile: Uint8Array | string) {
   let integrityObj;
   if (typeof contentOrFile === 'string') {
diff --git a/app/core/service/UserService.ts b/app/core/service/UserService.ts
index 9e1320bca..1d5df1514 100644
--- a/app/core/service/UserService.ts
+++ b/app/core/service/UserService.ts
@@ -13,6 +13,8 @@ import { LoginResultCode } from '../../common/enum/User';
 import { integrity, checkIntegrity, randomToken, sha512 } from '../../common/UserUtil';
 import { AbstractService } from '../../common/AbstractService';
 import { RegistryManagerService } from './RegistryManagerService';
+import { getPrefixedName } from '../../common/PackageUtil';
+import { Registry } from '../entity/Registry';
 
 type Optional<T, K extends keyof T> = Omit < T, K > & Partial<T> ;
 
@@ -75,16 +77,19 @@ export class UserService extends AbstractService {
     }
 
     const selfRegistry = await this.registryManagerService.ensureSelfRegistry();
-    const defaultRegistry = await this.registryManagerService.ensureDefaultRegistry();
+    const selfUser = await this.findUserByName(getPrefixedName(selfRegistry.userPrefix, name));
+    if (selfUser) {
+      return selfUser;
+    }
 
-    const selfUser = await this.findUserByName(`${selfRegistry.name}:${name}`);
-    const defaultUser = await this.findUserByName(`${defaultRegistry.name}:${name}`);
+    const defaultRegistry = await this.registryManagerService.ensureDefaultRegistry();
+    const defaultUser = await this.findUserByName(getPrefixedName(defaultRegistry.userPrefix, name));
 
-    if (selfUser && defaultUser) {
-      throw new ForbiddenError(`${name} is ambiguous, please use ${selfUser.name} or ${defaultUser.name}}`);
-    }
+    return defaultUser;
+  }
 
-    return selfUser || defaultUser;
+  async findInRegistry(registry:Registry, name: string): Promise<UserEntity | null> {
+    return await this.findUserByName(getPrefixedName(registry.userPrefix, name));
   }
 
   async findUserByName(name: string): Promise<UserEntity | null> {
diff --git a/test/port/controller/UserController/showUser.test.ts b/test/port/controller/UserController/showUser.test.ts
index 245ce502a..e30e272c5 100644
--- a/test/port/controller/UserController/showUser.test.ts
+++ b/test/port/controller/UserController/showUser.test.ts
@@ -17,6 +17,31 @@ describe('test/port/controller/UserController/showUser.test.ts', () => {
       });
     });
 
+    it('should clean prefix info', async () => {
+      const { authorization, email } = await TestUtil.createUser({ name: 'npm:banana' });
+      const res = await app.httpRequest()
+        .get(`/-/user/org.couchdb.user:npm:banana`)
+        .set('authorization', authorization)
+        .expect(200);
+      assert.deepEqual(res.body, {
+        _id: `org.couchdb.user:banana`,
+        name: 'banana',
+        email,
+      });
+    });
+
+    it('should return self user first', async () => {
+      const { authorization, email } = await TestUtil.createUser({ name: 'npm:apple' });
+      await TestUtil.createUser({ name: 'apple' });
+      const res = await app.httpRequest()
+        .get(`/-/user/org.couchdb.user:apple`)
+        .set('authorization', authorization)
+        .expect(200);
+
+      assert.equal(res.body.email, email);
+    });
+
+
     it('should 404 when user not exists', async () => {
       const { authorization, name } = await TestUtil.createUser();
       let res = await app.httpRequest()