Abstract: The Web-based petrolog mineralogy data processing system work in the mode of browser/server,the client computing platform is browser and the application and database run in the server This article introduce the present situation and trend of petrology minera logy data processing software and management system,and example of the implementation of Web-based Petrology dada processing program,and discusses the implementation method and advantage of developing Web-based petrolog y-mineralogy data-processing system,which provet he necessity and possibility of developing Web-based data-processing system.