From Shanghai to Suzhou, the bullet trains will help you a lot. You can go to take the bullet train at Shanghai Railway Station. It takes about more than 30 minutes to arrive in Suzhou.
From Beijing to Suzhou, there are three trains within a day. They are not bullet trains. The slowest train is Train 1461. Don't choose it. It will take you about 21 hours to get to Suzhou. The other two trains are Z85 and T284. If you cannot stand such a long time, you may go to Suzhou by air at Beijing airport.

so its much better to go to suzhou fr shanghai then.u said fr shanghai to suzhou by bullet train only 30 min rite?

Yes. As the timetable shows that the fastest train take 34 minutes from Shanghai to Suzhou!