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In recent years,indoor space of human activities has been more and more huge and complex.POI (Point of Interest) has been increasingly abundant.There is an intense trend of positioning and navigation in parking lot,shopping mall and airport.Meanwhile,its a matter for computer to recognize the specific position in the room on exact-marketing,intelligent manufacturing,robot and no one care etc.These requirements bring in a huge opportunity for IPS(Indoor Positioning System).Although GNSS has made great success in the aspect of positioning in recent years,traditional positioning (satellite positioning,base station location) cant be able to meet the indoor positioning because of technical restriction.At present,using Wi-Fi or Bluetooth beacon positioning technology that it acquires user position by detecting the RSSI power and matching beacon position faces huge challenges on account of laying a number of beacon station on Wi-Fi or Bluetooth positioning system,poor stability in the results of positioning and the terrible noise interference.The paper comes up with a positioning system of Bei-Dou compatible system,which is prominent to reduce the change of intelligent mobile terminal and the complexity of infrastructure construction on indoor positioning,realizes indoor-outdoor positioning compatibility and seamless connection.The core of the system is high performance multi-output satellite navigation signal simulator.Every output port of the simulator is provided with independent output function of single satellite signal and produces the pseudolite signal that can be compatible with BeiDou system air interface and design special broadcast content.The receiver combines Carrier-phase smoothing with difference positioning technology and achieves indoor-outdoor seamless positioning by BeiDou positioning terminal.This paper builds BeiDou compatible indoor-outdoor positioning testing system and provides the test data and conclusion by test evaluation.