I will arrive at Ningbo airport on 8th aug at 9pm and wants to go to taizhou, which is the best way?

There is bullet train running till 21:51 from Ningbo to Taizhou. Since you will arrive at 9pm, it may be hard for you to catch this train. The only way may be to take a taxi. I advise you to stay in Ningbo for one night, then take bullet train the next day from Ningbo to Taizhou.