hai. where, what and how to take transportation direct from Shenzhen airport to Guangzhou Airport ?

I'm afraid there is no direct public transportation between the two airports. It is suggested to take high-speed train to travel!

Take airport shuttle bus no. 330 or local subway Luobao Line to Luohu Train Station, where there are high-speed trains to Guangzhou East. Near the train station, take shuttle bus line 6 to Baiyun Airport.