The use of Landsat false color composite image is widespread in our country. But the band composite and exposure ratio of

three base color is controlled by experience with some blindness.In this paper a project of false culor composite is proposed. This project can enhance the-diresolving targets on image in forms of different colors more easily

quickly and accurately.The chromatic coordinates and brightness values on the composite screen can be calculated in concrete value. It in creases the interpretation accuracy and provides data for computer-assisted cartography.This paper deals with the basic principle

calculating formula and projecting steps gives examples for project and analyze the display effect of information in our project.