Abstract: This paper provides an overview of the TrackRT following up with a focus on precision as-sessment.Aiming at evaluating both inner and outside line precision,the input section in TrackRT isredeveloped,and two groups of ground motion experiments were designed.Comparing the resultingcoordinate trajectories with actual trajectories,the experiments illustrat that a real time kinematic po-sition accuracy can be achieved with accuracy at 2cm for horizontal components and better than 4cmfor vertical components,respectively.