The algorithm implementation and workflow of Beidou short baseline relative positioning with high precision are introduced at first, especially the differences and similarities between static baseline solution and RTK solution are proposed, calculation accuracy and time length of static solution are tested and analyzed, RTK solution accuracy is also tested and analyzed in this paper. Experimental results show that: horizontal precision is superior to 1cm+1ppm, vertical precision is superior to 1cm+2ppm, suitable observation period of short baseline is 1 to 1.5 hours and RTK solution precision is lower than static baseline solution precision. In 1sigma, horizontal precision and vertical precision of RTK are close to precision of static baseline solution.