GAMIT/GLOBK software was adopted to complete the batch processing for IGS station data. Combined with the baseline solution for the site control network data obtained from some tracking station of the Interna- tional Geomechanical Service Organization (IGS)， this paper obtained GPS baseline vector, station coordinates and station speed and the reliability analysis was also carried out. The research results show that the error in the coordinate component of each baseline does not exceed 1cm and the median error of the baseline length is not more than 3mm. The coordinate of the plane coordinate is in millimeter precision, which can meet the basic re- quirements of base-line computing with high accuracy.