Firstly, this paper reviews and analyzes historic background of urban-rural integration of Chongqing, and the evolution and trend of urban and rural dual economic structure. On the basis of previous researches, it selects factors and variables influencing urban and rural dual economic structure, and establishes an econometric model. By state space Kalman filtering method, it analyzes dynamic influence of factors upon urban-rural dual economic intensity. According to empirical conclusion, it puts forward corresponding policy recommendations for promoting integrated urban and rural economic development of Chongqing.