is there any bus that can take me to wenzhou south station from the airport?or i hav to take a taxi?

There is no direct bus from Wenzhou Airport to the South Bus Station. If you take a taxi, the fare is about CNY100 at least. On the other hand, you could take airport shuttle bus (CNY12) to its terminal in downtown area and then hire a taxi driving to the bus station. This way should be much cheaper.