Abstract: WebGIS is a kind of technology, which employs the Internet as its environment, adopts Web pages as the user interface of GIS software, combines the GIS technology with the Internet and provides all kinds of GIS application with GIS function. It’s applied in all kinds of GIS field, However, In the condition of the upsurge in the number of clients, it’s easy to form "bottleneck" of computing resources in the server side, causing the server load and network latency. It can affect the user's normal use in severe condition. This study solves the bottleneck of the server-side problem by changing the architecture of the existing WebGIS. The experimental results show that the new transmission mode can solve the bottleneck problem at a certain extent.