Is it easy to find a taxi at hefei airport to go to Chaohu if we arrive at midnight?

It won't be that hard to catch a taxi then, but the drivers may charge much higher. Usually, they may charge around CNY400 and you may have to pay more. If you don'd mind, I sugegst you stay near the airport for a night and head for Chaohu in the next morning by direct shuttle bus, which costs CNY53-55/person I remember.