Please let me know for dependent S1 and S2 VISA which documents required?

I am Pankaj Ingole from India. I am Working in Pharmaceutical Research , I have Z Work Z and one year resident permit . I want to invite my family to china by depenedent S1.
Please let me know which documents required for S1 type?
Is their Confirmation of Invitation for china embassy is required for dependent type ? If yes please suggest me how i will get this , because i ask to china embassy regarding confirmation of invitation letter for dependents but they told we have right to issue this confirmation to only for Work employer not for Working employer relative.