In this study GPS project planner's knowledge and experience, standard and specifications of procedures are integrated into a Knowledge Base with a C++ programming. After knowledge-based rules testing, it is found out the Knowledge Base is useful to plan a reasonable GPS network design. The GPS project planner can use similar geometric figure to design network and avoid negligence of artificial operation. In the part of assignment model, Knowledge Base is used to arrange logistical scheme of GPS field survey in whole sessions in accordance with knowledge-based rules. The method can successfully assign field surveyors to visit next stations with cost efficiency no matter what surveyor has any design experience.