Abstract: Based on RS and GIS and other technical means, this paper collects remote sensing images of Kaifeng at different periods, and adopts methods of supervised classification and unsupervised classification to analyze urban expansion by means of extracting the urban built-up area boundary.Combined with statistical methods and accompanied by urban expansion intensity index, it researchs the quantity feature and spatial feature of changes in Kaifeng city.By analyzing the various affecting factors such as the society, economy, environment, population and policy and so on, this paper studys the driving force of urban expansion, as well as the influence produced due to the city dynamic changes.