Pudong airport t2 to suzhou

1. According to your arrival time, neither bus nor bullet trains are available. There are only ordinary trains available, but the earliest departure upon your arrival is at 04:30. A long time to wait and almost morning.
So if you are not in a hurry, you can spend one night in SH, and take a train to Suzhou from the main railway station or the south railway station the next day.
2. The distance between the two cities is about 90 miles (150km). Due to the long distance, I'm afraid no regualr bus will go. And you may need to charter a vehicle, which costs about CNY 600-800.

So this railway station, is it close to pudong airport? I will ride taxi to railwaystation how much?

It is closer than other railway stations, but not that close. If by taxi, it costs about CNY 220-230 in night time.

Thanks for ur reply, just one more question, does the ticket office in SH south railway already open at that time? I'm afrain not,

I think you mean SH railway Station. No worry, there will be ticket windows opened even at midnight. But there is a possibility the tickets are sold out. So if possible, you can book a ticket in advance.