I need to take a bus from Pudong airport to Jiangyin. where can i find a timetable.

No direct bus can take you from the airport to Jiangyin. Well then, I have two suggestions for you:
1. At the airport, take a bus to Wuxi first and buses for the route are scheduled from 10:10 to 20:40. Upon getting there, you can go to Wuxi Bus Station to take a bus to Jiangyin!
2. Take shuttle bus line 5 to SH Railway Station and walk to the nearby General Long-distance Bus Station to take a direct bus to Jiangyin then.

Buses from the General Bus Station to Jiangyin are scheduled from 06:50 to 19:00 every day, 24 buses a day! The bus fare is CNY61 per person by the way.