diff --git a/README.md b/README.md
index 09b3a5e..3bcbac9 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # TeleInviter
 Invite members, from (many) `source_groups` to (one) `destination_group`
-And avoid repetition from `destination_group`
+and avoid repetition from `destination_group`
 
 # ENV
 - python3
@@ -10,11 +10,12 @@ And avoid repetition from `destination_group`
 - `pip3 install peewee`
 - `pip3 install colorama`
 - `pip3 install pprint`
-- maybe some packages i forgot..
+- maybe some packages I forgot...
 
 # RUN
 - make a configuration file named `conf.py`
 - run `py main.py`
+- init database `python3 db_init.py`
 - two confirmation during the processing
 
 # Developing
diff --git a/db.py b/db.py
index 20dbd2a..cbab683 100644
--- a/db.py
+++ b/db.py
@@ -59,3 +59,22 @@ def save_invite(u):
         invite.save()
 
     return invite
+
+
+class KeyPosition(BaseModel):
+    pause_position = CharField(unique=True)
+
+
+def get_create_or_update_pause_position(position=None):
+    # create
+    if position is None:
+        position = 0
+
+    key_position, created = KeyPosition.get_or_create(pause_position=position)
+
+    # update
+    if position is not None and (position >= key_position.pause_position):
+        key_position.pause_position = position
+        key_position.save()
+
+    return key_position.pause_position
\ No newline at end of file
diff --git a/db_init.py b/db_init.py
index f0cda16..bd5fda1 100644
--- a/db_init.py
+++ b/db_init.py
@@ -3,6 +3,6 @@
 
 
 db.connect()
-db.create_tables([Invite])
+db.create_tables([Invite, KeyPosition])
 
 print('Database: initialization complete!')
diff --git a/main.py b/main.py
index a232a30..606c3e4 100644
--- a/main.py
+++ b/main.py
@@ -113,9 +113,10 @@ def invite_user(u):
         except errors.rpcerrorlist.PeerFloodError as e:
             sys.stdout.write(colorama.Fore.LIGHTRED_EX + '\n              error#9. PeerFloodError > ')
             sys.stdout.write(colorama.Fore.LIGHTMAGENTA_EX + '%s ' % e.message)
-            print('... Retry after 2 Mins ...')
-            time.sleep(120)
-            invite_user(u)
+            # Prepare to exit: record the position of job failed
+            db.get_create_or_update_pause_position(i)
+            # When PeerFloodError occurs, it should better not to use this client any more
+            sys.exit(0)
     else:
         print(colorama.Fore.GREEN + 'skipped')
 
@@ -317,8 +318,9 @@ def is_user_status_offline_passed(t):
 
 # Start inviting
 print(colorama.Fore.LIGHTCYAN_EX + '\n\nStarting inviting:')
-i = 0
-for u in participants[client_sessions[0]]:
+# leave back or use the position you want to start from
+i = db.get_create_or_update_pause_position()
+for u in participants[client_sessions[0]][i:]:
     if u.bot is False:
         # skip bots
         if len(get_user_display_name(u)) > conf.filter_user_display_name_too_much_words_limit:
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..6050f9d
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+Telethon==1.1.1
+Telethon-sync==1.0.4
+PySocks==1.6.8
+peewee==3.6.4
+colorama==0.3.9
+pprint==0.1
\ No newline at end of file