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GLONASS and COMPASS system have become important part of GNSS system in the past few years.With the construction and improvement of these systems,multi‐system combined solutions will greatly improve the accuracy in GNSS positioning.The current research of multi‐system positioning mainly focuses on the combination of GPS and GLONASS systems,while the data of COMPASS has not combined with other systems.This paper focuses on the GPS/GLONASS/COMPASS multi‐system combined positioning.Experiments using the data of GPS/GLONASS/COMPASS capable stations were conducted for positioning.Results show that the accuracy of triple‐system positioning is better than that of single or combination of two systems.To reduce the noise of the pseudorange,a real‐time algorithm called CNMC is applied.The smoothed GNSS pseudorange is then used for combined positioning.Results show that this method can improve the reliability of the estimated parameters and improve the positioning precision by about 30%~60%,depending on the precision of the satellite orbits and clocks.A station differentialstrategy is proposed to reduce the effect of orbits and clocks,which is proved to dramatically improve positioning precision.