diff --git a/src/app/modules/admin/member/partner/compose/regist-compose.component.html b/src/app/modules/admin/member/partner/compose/regist-compose.component.html
index 109a5cd..9e44ee9 100644
--- a/src/app/modules/admin/member/partner/compose/regist-compose.component.html
+++ b/src/app/modules/admin/member/partner/compose/regist-compose.component.html
@@ -32,7 +32,11 @@
     <!-- Bcc -->
     <mat-form-field>
       <mat-label>회원 아이디</mat-label>
-      <input matInput [formControlName]="'signinId'" />
+      <input
+        matInput
+        [formControlName]="'signinId'"
+        (focusout)="__checkSigninId($event)"
+      />
     </mat-form-field>
 
     <!-- Subject -->
diff --git a/src/app/modules/admin/member/partner/compose/regist-compose.component.ts b/src/app/modules/admin/member/partner/compose/regist-compose.component.ts
index 6ec4439..8e3b966 100644
--- a/src/app/modules/admin/member/partner/compose/regist-compose.component.ts
+++ b/src/app/modules/admin/member/partner/compose/regist-compose.component.ts
@@ -1,6 +1,7 @@
 import { Component, Inject, OnInit, ViewEncapsulation } from '@angular/core';
 import { FormBuilder, FormGroup, Validators } from '@angular/forms';
 import { MatDialogRef, MAT_DIALOG_DATA } from '@angular/material/dialog';
+import { IdentityService } from 'app/modules/polyglot/member/services/identity.service';
 
 export interface RegistComposeData {
   title: string;
@@ -45,7 +46,8 @@ export class RegistComposeComponent implements OnInit {
   constructor(
     public matDialogRef: MatDialogRef<RegistComposeComponent>,
     @Inject(MAT_DIALOG_DATA) public data: RegistComposeData,
-    private _formBuilder: FormBuilder
+    private _formBuilder: FormBuilder,
+    private _identityService: IdentityService
   ) {}
 
   // -----------------------------------------------------------------------------------------------------
@@ -116,4 +118,14 @@ export class RegistComposeComponent implements OnInit {
    * Send the message
    */
   send(): void {}
+
+  __checkSigninId(event: FocusEvent): void {
+    const signinId = this.composeForm.get('signinId')?.value;
+    // console.log(event, '::', signinId);
+    this._identityService
+      .checkUsernameForDuplication(signinId)
+      .then((isUse: boolean) => {
+        console.log('check username: ', isUse);
+      });
+  }
 }