I want to visit my husband who is a student in china.how do i apply

If you want to visit him for a long time, you can apply for an S type. You need to prepare those documents first: your passport and copy of its data page, a filled-out application form attached with a passport-style photo, physical examination report, an invitation letter from your husband and copies of his passport and residence permit, as well as your marriage certificate, and your recent 4-month bank statement. And then submit the application to the embassy of PRC to apply for the S type.