Population aging problem becomes increasingly severe in the process of economic and social development in China. In this paper, urban people’s death rates are estimated by age and gender respectively, then the women’s birth rates are predicted using Grey- Models. Furthermore, Chinese urban population structure is predicted. From the results and analysis, it can be clearly seen that the population aging in China is becoming more and more severe under our current policies. That a sharply decline for the population of labor force would affect the development of Chinese economy.