is there a boat from guangzhou central port to macau..where can we get the boat and how long ..tnx

I do not think there is a central port in GZ. Nansha Port is suggested for you, if you want to take a ferry for Macau.
Currently, as far as I know, the ferry for Macan is not in operation, so it is suggested to call the port for confirm and the phone number is 020-84688963.