Abstract: Cellular network has low accuracy and GPS has insufficient information in complex environment,aiming at the irresistible detects in respective positioning system,we presented a combined positioning method based on the GPS and cellular network,to improve the availability of positioning,and improve the positioning accuracy.And aiming at the main factors affecting the accuracy of GPS/cellular combination positioning system NLOS transmission,we also adopt two scatterer model to suppress NLOS propagation effects,the idea was to take scatter as a virtual base station,inhabiting of cellular NLOS error,auxiliary GPS positioning,and improving the dilution of position (DOP),transforming the NLOS error into a decisive model factors,so the precision mainly depended on the orientation of the measuring accuracy of the parameters and unrelated to non direct wave caused by parameter deviation,so the method improved GPS/cellular hybrid positioning accuracy in complex environment.Through simulation experiments in the static,movement,ROS model and Gauss noise propagation environment,the method showed that the results had higher accuracy and stronger robustness.