Nowadays, existing WebGIS applications are isolated from each other. It is meaningful and challenging to integrate these existing applications to reduce resource loss. In this paper, the concept of WebGIS integration service is presented and its classification including width integration and depth integration is brought out. According to width integration and depth integration, a general standard of WebGIS integration is proposed. The merits of WebGIS integration service are analyzed with the representa-tive examples from both of the two classes mentioned above.
