diff --git a/qbay/__init__.py b/qbay/__init__.py
index d2a1cb4..103608f 100644
--- a/qbay/__init__.py
+++ b/qbay/__init__.py
@@ -5,3 +5,4 @@
 app = Flask(__name__)
 app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///../db.sqlite'
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+app.app_context().push()
diff --git a/qbay/__main__.py b/qbay/__main__.py
index f08984c..493eda5 100644
--- a/qbay/__main__.py
+++ b/qbay/__main__.py
@@ -1,2 +1,25 @@
 from qbay import *
-from qbay.models import *
\ No newline at end of file
+from qbay.cli import login_page, regsiter_page
+
+
+def main():
+    while True:
+        selection = input(
+            'Welcome. Please type 1 to login. '
+            'Or type 2 register. Or type 3 to exit')
+        selection = selection.strip()
+        if selection == '1':
+            user = login_page()
+            if user:
+                print(f'welcome {user.username}')
+                break
+            else:
+                print('login failed')
+        elif selection == '2':
+            regsiter_page()
+        elif selection == '3':
+            break
+
+
+if __name__ == '__main__':
+    main()
diff --git a/qbay/cli.py b/qbay/cli.py
new file mode 100644
index 0000000..2633197
--- /dev/null
+++ b/qbay/cli.py
@@ -0,0 +1,19 @@
+from qbay.models import login, register
+
+
+def login_page():
+    email = input('Please input email')
+    password = input('Please input password:')
+    return login(email, password)
+
+
+def regsiter_page():
+    email = input('Please input email:')
+    password = input('Please input password:')
+    password_twice = input('Please input the password again:')
+    if password != password_twice:
+        print('password entered not the same')
+    elif register('default name', email, password):
+        print('registration succeeded')
+    else:
+        print('regisration failed.')