If you are in the center of Kunshan, you can of course choose the subway. Please refer to the above. Or take the train to the railway station or Hongqiao station, then take the subway 1 and get off at hengshan road, then go south along hengshan road to Gaoan Road, turn right and go north, about 0.8km to Shanghai Library;
If the train goes to Hongqiao Station, you can take the 10 subway and get off at Shanghai Jiaotong University Station, and then follow the instructions above.