Sha Tin in HK to Guangzhou hai zhu square

From Sha Tin New Town Plaza, you can find direct buses to reach GZ directly and among them, you can take the bus to reach GZ Hotel. Get off the bus, you can walk to reach Haizhu Suqare.
The travel time is around an hour and a half to two hours. The ticket fare for two adults is 200HK$ for two persons. and for kids, the fare is 180HK$ for the two.

Thanks Eileen. I suppose taking the bus from Shatin New Town Plaza to GZ Haizhu square is cheaper than cab/train.