hi, i want to extend one month more my wife visa. she came here on 10th april and she has S1 visa.

If your wife has Chinese residence permit, she can try to extend the residence permit for a longer stay. She needs to provide passport, a passport-style photo, a completed application form, Chinese residence, an invitation letter from you and copy of your passport and residence permit, as well as your marriage certificate. And then go to the exit and entry administration of the local PSB extend it.