how to apply visa for my wife to take her with me

You should apply an S1 type for her. The documents you need to show to the embassy are: 1. an invitation letter from the duly authorized unit or your school; 2. an invitation letter from you; 3. the photocopy of your passport and residence card;, 4. the orginal and photocopy of your marriage certificate which has been attested by the Pakistani Foreign Affairs Ministry; 5. her valid passport and a photocopy of it; 6. an application form with her recently taken photo on it; and 7. her medical report issued by a local public hospital and authenticated by the Pakistani Foreign Affairs Ministry.