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This paper first discussed the mathematical model of BeiDou/GPS combined pseudo-range point positioning. And then observational data of Beijing and Wuhan stations was used to compare BeiDou/GPS combined solution results with BeiDou and GPS single system solution results on the aspects of satellite visibility, PDOP value, positioning accuracy and usability in multiple simulative masking environment. The numerical results showed that compared with the pseudo-range point positioning of a single system, BeiDou/GPS combined positioning greatly increases the number of visible satellites and reduces the PDOP value. In addition, the combined system can effectively improve the positioning accuracy and the usability under poor observation conditions. [ABSTRACT FROM AUTHOR]