Objective: Modern industry has affected the role of women by creating jobs mainly dealt with producing ones. As women entered the labor market in growing numbers it became evident that their position was not the same as that of men. The aim of current research was an analysis of wage structures and of their role in the gender payment discrepancy. A question that can be addressed is the difference between knowledge, skills and aptitudes of men and women with same wages. Method: Participants were 98 men from car producing company and 98 women from textile complexes in Tehran and Isfahan. They were compared with each other basedon their wages, education and tenure and their job dimensions referring to knowledge, skills and aptitudes (KSA). Position Analysis Questionnaire was the job analysis instrument. Findings: Results indicate that women were superior in their KSA after matching wages in other words, women with the same knowledge skills and aptitude receive less from compensation system. Promotion of KSA was more than women among men in population. Results: Because women KSA can be expected to increase in future, paying attention to gender justice in work setting according to KSA is important.