how much the taxi fare from baiyun airport to yang shuo ?

Do you refer to the Yangshuo County in Guangxi? Well, it is a long distance, over 400km. Generally, you can hardly hire a taxi for such a long trip. It is best to travel by public transportation:
1. Fly from Guangzhou to Guilin, and then transfer to the direct bus to Yangshuo.
2. Take subway line 3 to Jiahewanggang and change to line 2 to South Railway Station. There you can take a bullet train to Yangshuo directly within 2h and 10min.