I'll be ariving zhuhai airport at 11:30 pm (almost midnight) can someone tell me which shuttle bus to take for gongbei district?

You can still find the buses ZH city downtown, but I am not very sure the buses can reach the Gongbei or not. It is suggested to consult the airport staff directly.
In my opinion, you can take the shuttle buses to reach ZH downtown and then change to a taxi to the Gongbei District.
The Gongbei District is not very far from the city downtown.