With the construction of BD-3 satellite navigation system, PPP-B2b signal provides PPP (Precise Point Positioning) service, which provides an effective basis for realizing real-time PPP. The real-time PPP method based on PPP-B2b signal is studied, and the real-time and fast calibration of reference point are realized. At the same time, the real-time calibration results are verified by the RTK relative positioning results of two points. The results show that the accuracy of calibration results can reach 0.1m within 30 minutes, which can be applied to the rapid acquisition of high-precision reference position.