With the development of press technology and personalization of map, the accuracy of map color is increasingly demanded. People want to achieve the WYSIWYG effect. However, because of the hardware characters of the input and output devices and the lack of color management in GIS softwares, the colors in the GIS mapping process are inevitably changed. In this paper, based on the analysis of the reasons that the map colors are changed during mapping in GIS, study the realization of color management in GIS, construct a GIS color management model, and present a GIS color management system realization method. Based on this study, realize the GIS color management module with the object-oriented method.