diff --git a/pre_registration/lambda_function.py b/pre_registration/lambda_function.py
index d37013a..589db05 100644
--- a/pre_registration/lambda_function.py
+++ b/pre_registration/lambda_function.py
@@ -11,15 +11,15 @@
 def initialize_table(connector):
     connector.execute_one(pre_registration_query.create_table_query)
 
-def check_pre_registration_exists(connector, phone_number):
-    result = connector.execute_one(pre_registration_query.check_exist_query, (phone_number,))
+def check_pre_registration_exists(connector, params):
+    result = connector.execute_one(pre_registration_query.check_exist_query, params)
     return result is not None
 
 def add_pre_registration_request(connector, message):
     initialize_table(connector)
 
     # 중복체크
-    if check_pre_registration_exists(connector, message['phone_number']):
+    if check_pre_registration_exists(connector, (message['phone_number'], message['hangout'])):
         return None
 
     return connector.execute_one(pre_registration_query.insert_query, (message['phone_number'], message['hangout']))
diff --git a/pre_registration/pre_registration_query.py b/pre_registration/pre_registration_query.py
index 17483e9..e2932b7 100644
--- a/pre_registration/pre_registration_query.py
+++ b/pre_registration/pre_registration_query.py
@@ -15,5 +15,5 @@
     """
 
 check_exist_query = """
-    select id from pre_registration_request where phone_number = %s LIMIT 1;
+    select id from pre_registration_request where phone_number = %s and hangout = %s LIMIT 1;
 """
\ No newline at end of file