Urban economic development is connected with the economy contribution of various counties in this city, and the differences between various counties and urbans development will affect the economic development of the whole city. Zhuzhou city is developing rapidly in recent years, but there is a big difference between various counties and urbans development. By studying the comprehensive economic strength problems of the counties and urbans of Zhuzhou city with factor analysis method, it puts forward 14 index that reflecting the city's comprehensive economic strength according to statistical yearbook of Zhuzhou. The results reflect the differences between various counties and urbans economic development in Zhuzhou, provide reference for its economic development as well.