please help me to go to Shenzen Xiaomeisha sea world from Guangzhou?

You can take high-speed train from Guangzhou South Railway Sation to SZ North Railway Station first.
Then take subway Huanzhong Line to Buji Station and then take Longgang Line to Henggang Station, Exit A. After that, take bus no.380 B to the Xiaomeisha Bus Terminal directly. Walk northeast around 0.6 miles.