This paper has analyzed the quality of high resolution ALOS satellite images by an empirical analysis method. Based on characteristics of ALOS images, the authors present methods and the flow of ALOS raw images preprocessing. The result shows that the images of ALOS should be used in combination with the images of other satellites when we conduct large-scale, large-area, high-precision and short-cycle land use map updating and dynamic monitoring. This is because the images of ALOS have such shortages as large amounts of work and strict application.