For your wife, she can apply for a family visit visa (L). You need to provide her an invitation letter, a photocopy of your identity document and residence permit in China.
She can submit all these to Chinese embassy together with a proof of relationship, the original passport with at least six-month validity and two blank visa pages, one photocopy of the passport page containing the personal particulars, visa application for China and One recent passport-photo size color photograph.
In addition, bank statements, round-trip air tickets booking may be required according to the merits of each applicant.