The contradiction between massive Distributed-GIS data and limited bandwidths of network resources is becoming more and more serious, and the inquiry of distant vector data and the transmission of massive data have become the key to the problem. Based on analyzing the method of massive data inquiry, combined with the query optimized method of spatial database and cost function, the authors propose a vector data inquiry method which is optimized and can be transplanted to the client and realize the data inquiry of topologic differences. Experiments have proved that this method is effective in improving the inquiry speed and maintaining a good network-load performance.