Using the high‐accuracy OEM board,which contains of BDS B1/B2/B3 and GPS L1/L2 frequency,this paper realized the embedded algorithm of RTK of BDS,GPS and BDS+GPS.Both static and ground kinematic tests were carried out to evaluate the precision of the embedded algorithm of RTK from BeiDou,GPS and BDS+GPS.In static mode,the results demonstrated that the accuracy ofstatic zero‐baseline was sub‐mm for the horizontal component and 1mm for vertical component using BDS.The proportion of the fix resultswere higher than 98%.The accuracy of GPS for 10km static baseline,whose difference of horizontal component was smaller than 1cm and the vertical component was smaller than 3cm,was better than BDS,whose difference for three component was better than 4cm.The statistics accuracy of GPS for 10km baseline was better than 4mm for horizontal component and better than 2cm for vertical component,and the BDS was better than 1.5cm for horizontal component and better than 3.5cm for vertical component.The proportion of the fix resultswere higher than 95%.For kinematic baseline,the result of integration positioning was accordant to the real topography,and the standard deviation of adjustment of every epochwas better than 6mm.