Hello,

Requirement for appliying family visa is menstioned on the back side of the form ( visa application form )
1. passport copy of your wife.
2. picture ( photo )
3. n.o.c from company ( Letter from company )
4.Marrage certificate and your education certificate.
5. 3 months or 6 months Bank's statement showing your salary credited to your account.
more information you can get from the www.moi.gov.qa site

All the best