Abstract: This paper reviews the basic concept of GIS and WebGIS briefly. It summarizes some methods to build WebGIS system and their characteristics. According to the development practice from the application of WebGIS in "The Stress and Geologic Disaster Database System", it analyzes the compositions and capabilities of MapObjects Internet Map Server components and MapObjects components which were made by the Environmental System Research Institute, Inc. And it also introduces how to use MapObjects Internet Map Server components to creat and serve Internet mapping applications(called map services on the Internet) and to access maps from Web client applications.