diff --git a/Base/Controller/FOCommon.cs b/Base/Controller/FOCommon.cs
index 92a34ee..8ee9aae 100644
--- a/Base/Controller/FOCommon.cs
+++ b/Base/Controller/FOCommon.cs
@@ -498,8 +498,24 @@ namespace NP.Base.Controllers
         {
             try
             {
-                Dao.Save("users.snslink.up", new System.Collections.Hashtable() { { "userno", SUserInfo.UserNo }, { "snsid", snsid }, { "jointype", jointype }, { "uno", SUserInfo.UserNo }, { "uip", GetUserIP() } });
-                return JsonBack(new JsonRtn() { code = 1 });
+                if (string.IsNullOrEmpty(snsid) && jointype == 0) //SNS 연동을 해제
+                {
+                    Dao.Save("users.snslink.up", new System.Collections.Hashtable() { { "userno", SUserInfo.UserNo }, { "snsid", snsid }, { "jointype", jointype }, { "uno", SUserInfo.UserNo }, { "uip", GetUserIP() } });
+                    return JsonBack(new JsonRtn() { code = 1 });
+                }
+                else //SNS 연동
+                {
+                    var result = Dao.Get<Users>("users.check.snsid", new Hashtable() { { "snsid", snsid }, { "jointype", jointype } }).Count();
+                    if (result > 0) //SNS 연동 중복체크
+                    {
+                        return JsonBack(new JsonRtn() { code = -99 });
+                    }
+                    else
+                    {
+                        Dao.Save("users.snslink.up", new System.Collections.Hashtable() { { "userno", SUserInfo.UserNo }, { "snsid", snsid }, { "jointype", jointype }, { "uno", SUserInfo.UserNo }, { "uip", GetUserIP() } });
+                        return JsonBack(new JsonRtn() { code = 1 });
+                    }
+                }
             }
             catch (Exception e)
             {
diff --git a/FO/Views/Account/SNSLinkCallback.cshtml b/FO/Views/Account/SNSLinkCallback.cshtml
index b534a09..6b717e0 100644
--- a/FO/Views/Account/SNSLinkCallback.cshtml
+++ b/FO/Views/Account/SNSLinkCallback.cshtml
@@ -92,6 +92,10 @@
             alert("연동하였습니다.");
             goRefresh();
         }
+        else if(capResult.code == -99){
+            alert("이미 연동된 SNS 계정입니다. SNS 계정을 다시 확인해주세요.");
+            return;
+        }
         else {
             alert("SNS 연동에 실패하였습니다. \r\n관리자에게 문의하세요.");
             return;