Hii, i will arrive at pudong airport at midnight, if there is bus available, where should i go ?

Don't worry.
You can still take the airport shuttle bus Night Line, which operates till 45min later of the last flight. It's easy for you to find the pick-up station according to the English signs. Get on the bus and buy the bus ticket from conductor.
This shuttle bus can take you to downtown area. After arriving, you can take a cab to your hotel directly.