As workspace Measurement and Positioning System(wMPS) has lower calibration efficiency,complex algorithms and relying on auxiliary equipment,this paper presents a novel self-calibration method by using inter-scanning method.According to the multi-place intersection theory and system application characteristics,the automatic calibration was implemented by a inter-scanning technology on receivers mounted on the laser stations whose coordinates were known in advance.On the basis of two laser stations,the mathematical theory of the method was described,and the optimal algorithm(adjustment model) based on the geometrical constraint characteristics of the system was given in detail.The method was verified on a wMPS experimental platform developed by Tianjin University and was compared with the standard rule calibration method.The experimental results demonstrate that the inter-scanning method is an efficient solution for calibration of the stations,and the accuracy of the system achieves 0.6 mm in the space 5 m away from the station.Thus,the method proposed improves the calibration efficiency of the system while maintaining the measurement accuracy.