I've heard about Hengqin ocean kingdom in Zhuhai, how to go there from guangzhou ?

Since you take the train, which station will you reach? The North Railway station or the ZH Railway station Gongbei?
if you reach the ZH Railway station, you can first take the bus line 101 to reach Guang Ao Ping Tai Station (Macau Sightseeing Platform Station) and then change to bus line K10 to the Chimelong Station. Then you can walk to the Ocean Kingdom.

Thanks tommyfor your quick reply...
Which station nearest to hengqin, Zh north or Zh railway station ? Do you know the approximate taxi cost to hengqin ?

Well, ZH North Railway Station is closer to your destination; though, around 90km. It will cost you a lot by taxi. However, the best way shall be to take a light rail train at ZH Railway Station (Gongbei Station) to Guangzhou South in around an hour and twenty minutes. Then u can take a taxi to the Chimelong Resort, Ocean Kingdom, with the taxi fare of around 30.

Thanks for your info helen... but I think you're misunderstand...
I want to go to Chimelong Hengqin ( not Chimelong resort in Panyu ), I'll take train from guangzhou south to ZH...I don't know which train station is nearest to Chimelong Hengqin...Zh north or ZH railway Gongbei..

This is Helen. Sorry for misunderstanding your question, Yongki.
ZH Gongbei Railway Station is closer to Hengqin Ocean Kingdom, around 21km. By taxi, it costs CNY60-70.