Abstract:Based on the data from 1978 to 2014.this paper analyzes the overall trend on urbanization and the coordinated development of agricultural modernization and its corresponding policy interpretation.This paper constructs index system of urbanization and agricultural modernization,determines the weight of each index by means of Principal Component Analysis,and then calculates the coupling degree and the coordinated development degree.The result shows that the chief bottleneck of restricting the coordinated development of urbanization and agricultural modernization was the development of agricultural modernization lagging behind urbanization for a long time; the coordinated development degree increased steadily during the sample period except for the early period of China’s reform and opening to the outside world; the dynamic mechanism of driving the coordinated development of urbanization and agricultural modernization was not the same in different development stages and there was obvious periodic correlation between the variation of coordinated development degree and the social and economic policies.