diff --git a/src/controllers/userController.ts b/src/controllers/userController.ts
index f82fada..a635cb9 100644
--- a/src/controllers/userController.ts
+++ b/src/controllers/userController.ts
@@ -7,7 +7,8 @@ import {
 } from '../intefaces/exception';
 import {
   CreateUserCommand,
-  CreateUserReq
+  CreateUserReq,
+  toCommand
 } from '../intefaces/createUserCommand';
 import { PostBaseResponseDto } from '../intefaces/PostBaseResponseDto';
 import { UserLoginDto } from '../intefaces/user/UserLoginDto';
@@ -37,6 +38,7 @@ import { SocialVendor } from '../models/socialVendor';
 import IUser from '../models/interface/IUser';
 import { AgeGroup } from '../models/user/ageGroup';
 import { Gender } from '../models/user/gender';
+import { createUser, validateNewLocalEmail } from '../services/userService';
 
 /**
  * @route GET /email
@@ -168,7 +170,7 @@ const verifyEmailTest = async (
 };
 
 /**
- *  @route /users
+ *  @route POST /users
  *  @desc 회원가입 api
  *  @access Public
  */
@@ -183,18 +185,9 @@ const postUser = async (
       throw new IllegalArgumentException('필요한 값이 없습니다.');
     }
 
-    const createUserCommand: CreateUserCommand = {
-      email: req.body.email,
-      password: req.body.password,
-      nickname: req.body.nickname,
-      ageGroup: req.body.ageGroup
-        ? AgeGroup[req.body.ageGroup]
-        : AgeGroup.UNDEFINED,
-      gender: req.body.gender ? Gender[req.body.gender] : Gender.ETC,
-      profileImgUrl: (req?.file as Express.MulterS3.File)?.location
-    };
-
-    const createdUser = await UserService.createUser(createUserCommand);
+    const createUserCommand = toCommand(req);
+    await validateNewLocalEmail(createUserCommand.email);
+    const createdUser = await createUser(createUserCommand);
 
     const jwt = getToken(createdUser._id);
 
diff --git a/src/intefaces/createUserCommand.ts b/src/intefaces/createUserCommand.ts
index c8f5a2c..441bcee 100644
--- a/src/intefaces/createUserCommand.ts
+++ b/src/intefaces/createUserCommand.ts
@@ -1,5 +1,6 @@
 import { AgeGroup, AgeGroupKey } from '../models/user/ageGroup';
 import { Gender, GenderKey } from '../models/user/gender';
+import { TypedRequest } from '../types/TypedRequest';
 
 interface CreateUserCommand {
   email: string;
@@ -18,4 +19,18 @@ interface CreateUserReq {
   gender?: GenderKey;
 }
 
-export { CreateUserCommand, CreateUserReq };
+const toCommand = (req: TypedRequest<CreateUserReq>) => {
+  const createUserCommand: CreateUserCommand = {
+    email: req.body.email,
+    password: req.body.password,
+    nickname: req.body.nickname,
+    ageGroup: req.body.ageGroup
+      ? AgeGroup[req.body.ageGroup]
+      : AgeGroup.UNDEFINED,
+    gender: req.body.gender ? Gender[req.body.gender] : Gender.ETC,
+    profileImgUrl: (req?.file as Express.MulterS3.File)?.location
+  };
+  return createUserCommand;
+};
+
+export { CreateUserCommand, CreateUserReq, toCommand };
diff --git a/src/models/user/user.ts b/src/models/user/user.ts
index 0237d6d..ddacd60 100644
--- a/src/models/user/user.ts
+++ b/src/models/user/user.ts
@@ -11,8 +11,7 @@ type UserDocument = IUser & IDocument;
 const userSchema = new Schema<UserDocument>(
   {
     email: {
-      type: String,
-      unique: true
+      type: String
     },
     socialId: {
       type: String,
@@ -60,7 +59,7 @@ const userSchema = new Schema<UserDocument>(
   }
 );
 
-userSchema.index({ socialVendor: 1, socialId: 1 }, { unique: true });
+userSchema.index({ socialVendor: 1, email: 1 }, { unique: true });
 
 const User = model<UserDocument>('User', userSchema);
 
diff --git a/src/services/socialAuthService.ts b/src/services/socialAuthService.ts
index 8e53191..784fd78 100644
--- a/src/services/socialAuthService.ts
+++ b/src/services/socialAuthService.ts
@@ -63,15 +63,22 @@ const findUserBySocial = async (
   return user;
 };
 
-const join = async (socialMember: IUser): Promise<UserDocument> => {
-  if (socialMember.email) {
-    const alreadyEmail = await UserService.isEmailExisting(socialMember.email);
-    if (alreadyEmail) {
-      throw new IllegalArgumentException(
-        `같은 이메일로 가입된 유저가 있습니다. email: ${socialMember.email}`
-      );
-    }
+const validateMemberState = async (preMember: IUser) => {
+  const alreadyUser = await User.findOne({
+    socialVendor: '$preMember.socialVendor',
+    socialId: '$preMember.socialId'
+  });
+  if (alreadyUser) {
+    throw new IllegalArgumentException(
+      `해당 소셜에 같은 이메일로 가입된 유저가 있습니다. email: ${
+        preMember.email || '이메일 알 수 없음'
+      }`
+    );
   }
+};
+
+const join = async (socialMember: IUser): Promise<UserDocument> => {
+  await validateMemberState(socialMember);
   socialMember.nickname = await UserService.autoGenerateNicknameFrom(
     socialMember.nickname
   );
@@ -98,26 +105,7 @@ const findSocialUser = async (socialMember: IUser) => {
   return alreadyMember;
 };
 
-const findOrCreateUserBySocialToken = async (vendor: string, token: string) => {
-  const response: SocialLoginResponse = await getUserFromSocialVendor(
-    token,
-    vendor
-  );
-  const socialVendor = SocialVendorExtension.getVendorByValue(vendor);
-  const socialMember: IUser = convertSocialToPiickle(socialVendor, response);
-  const isAlreadyMember = await isAlreadySocialMember(socialMember);
-  if (isAlreadyMember) {
-    const alreadyMember = await findUserBySocial(
-      socialVendor,
-      socialMember.socialId!
-    );
-    return alreadyMember;
-  }
-  return join(socialMember);
-};
-
 export {
-  findOrCreateUserBySocialToken,
   findUserBySocial,
   getPiickleUser,
   isAlreadySocialMember,
diff --git a/src/services/userService.ts b/src/services/userService.ts
index 081af64..8f3f2ec 100644
--- a/src/services/userService.ts
+++ b/src/services/userService.ts
@@ -30,9 +30,10 @@ const isEmailExisting = async (email: string): Promise<boolean> => {
   return false;
 };
 
-const validateEmail = async (email: string) => {
+const validateNewLocalEmail = async (email: string) => {
   const alreadyUser = await User.findOne({
-    email
+    email,
+    socialVendor: null
   });
   if (alreadyUser) {
     throw new IllegalArgumentException('이미 존재하는 이메일입니다.');
@@ -48,7 +49,6 @@ const createUser = async (command: CreateUserCommand) => {
     gender,
     profileImgUrl: profileImageUrl
   } = command;
-  await validateEmail(email);
 
   const user = new User({
     email,
@@ -241,5 +241,6 @@ export {
   createOrDeleteBookmark,
   nicknameAlreadyExists,
   autoGenerateNicknameFrom,
-  deleteUser
+  deleteUser,
+  validateNewLocalEmail
 };