What are document required for work visa inside of China ?

You need to prepare those documents to apply for the work Z type: your passport and its copy, the application form, a recently-taken color photo, an invitation letter of a duly authorized unit and alien employment permit. Usually, you can stay for one year in PRC if you enter with a work Z type.
Your wife can apply for an S1 type to enter PRC with you and the S1 type may allow her to stay there for more than 180 days. You should ask your employer to add your wife’s name on the invitation letter of a duly authorized unit. The first step is to provide the relevant materials: her passport and copy of its data page, an application form, a passport-style photo, an invitation letter from you, copy of your alien employment permit, the invitation letter of a duly authorized unit, and your marriage certificate.
The next step is to submit the application for S1 type to the CVASC along with the application for work Z type.