iam coming from zhengzhou so how can i reach pudong airport from shanghai bus station .

Which Shanghai Bus Station? If Shanghai Long-distance Bus Station you can walk to Shanghai Railway Station and take airport bus Line 5 to the airport. If Shanghai South Bus Station, walk to the south train station to take airport shuttle bus Line 7. You can also take subway Line 1 from both train stations to People's Square and then change to Line 2 to the airport either.