This paper studies the comprehensive urban competitiveness and performs the principal component analysis. The results show that the comprehensive evaluation of urban competitiveness is not entirely dependent on the city's economic strength or GDP, and it is necessary to consider from resource allocation capacity, openness and public service capacity. By selecting various data concerning 11 prefecture-level cities in Jiangxi Province in 2006, 2009 and 2012, this paper gets the ranking results and analyzes trends, to provide a basis for making future economic policy.