There are 3 ways to find your QQ ID:
1) Open your profile by clicking on your Profile Picture on the Main Panel. If your display ID is your QQ number, you should see it in your profile.
2) Go to Start menu in the lower left corner on your desktop
For Windows 7 and Vista, enter %AppData%\Tencent\Users\ in the “Search programs and files” or “Start search” field.
For Windows XP, select Run and enter %AppData%\Tencent\Users\
The search result contains folder(s) named after all the IDs that have ever logged in QQ from your computer.
3) Ask one of your QQ contacts to find you in his/her contact list, and then double-click on it to open your profile page where s/he can find your QQ ID.
You can also write to our Customer Support team (firstname.lastname@example.org) and provide the email you registered QQ International with and we can find your QQ number for you.