Economic argumentation for urban development should be the foundation of urban planning,because the economic development is the basis of urban development.In this paper,the connotation,types and composition of the economic costs of urbanization are discussed and the economic costs of urbanization in Chongqing municipality are calculated according to its economic and social development.On this basis,the future level of urbanization is calculated in the light of the economic capabilities to bring along development of urbanization in Chongqing municipality and the demand of funds for urban development in the future is calculated according to the economic costs of urbanization in Chongqing municipality.