关键词: 生育, 女性工资率, 固定效应模型, 群体差异

Abstract: Using 1993 － 2006 China Health and Nutrition Survey data，we test the motherhood penalty hypothesis with fixed-effects models. We find that fertility has a significant negative influence on women's wage and that each additional child lowers hourly wages by about 7 percent. In addition，the negative effect becomes larger as the number of children increases. The hypothesis holds true even if the women's human capital，job characteristics and family constraints are taken into account. We further explore whether the motherhood penalty varies by social group. The results show that the negative effect of having children is especially pronounced among women with high levels of education，women holding professional and managerial jobs，and women working in the state sector. The study shows that family factors play an important role in contributing to gender disparities in earnings and perhaps other labor market outcomes in contemporary China.

Keywords: Children, Women's Wage Rate, Fixed-effects Model, Group Differences