But the "Suzhou Library" you mentioned is not in Guanqian Street, but in Renmin Road ~
Guanqian Street is called Xinhua Bookstore ~
Sure, you can apply for a reader's card. You need an ID card +50 yuan deposit to go to the front desk.
Now you don't have to pay the annual fee as before, and the deposit can be refunded ~
PS: The study room is on the second floor.
I hope the above can help you ~