Based on the employer’s gender discrimination model, the costbenefit analysis of discrimination in the longterm and shortterm labor market shows that discriminatory employers become“consumers”of discriminatory costs, and the discriminated female workers are“payers”of discriminatory costs in the shortterm labor market; In the longterm labor market, discriminatory employers and the discriminated female workers are the“payers”of discriminatory costs, while the female workers that have left the discriminatory employers become the“beneficiaries”of antidiscrimination. Discriminatory employers earn less profits than nondiscriminatory employers in both shortterm and longterm labor markets. The degree of discrimination in the labor market mainly depends on the quantity of labor supply, the quantity of nondiscriminatory employers and the prejudice of discriminatory employers.