Abstract: In GIS Chinese inquiry system,the word meaning ambiguity has brought many troubles in understanding inquiry sentences correctly.The problem is analyzed carefully and a new algorithm is presented based on corpus which can solve ambiguity successfully.As an innovation,A new data structure,called "sentence link stack",is adopted in algorithm.The experimental results show that the algorithm can achieve accuracy of 95% and can offer valid information for the semantic analysis subsystem to draw inquiry targets,inquiry condition,group message and sort message.