z visa for my husband

I am teaching here in hebei province and my school got a work permit for me with my husbands name as accompanying family member. Now i dont know if this is for my husband to use to apply for a z type or s1 type. The school said they cancelled my foreign expert certificate and applied for a new work permit for me. Now they wanted me to get a new z type and my husband s1 type. But my residence permit is still valid until feb 2016 why would i get a new z type If my husband needs my residence permit copy to get his visa???? Im soooo confused i hope someone could help me because my school can not give me any answer. Thanks in advance.