Vehicle-borne mobile 3D measurement system can be used for rapid and accurate data acquisition and three-dimensional modeling.In order to solve the calibration problem of vehicle-borne mobile 3D measurement,a high-precision vehicle-borne mobile 3D measurement system calibration method is designed and a mathematical model of overall calibration is built.Then,experiments are carried out and analysis of the measurement accuracy of the 3D measurement system before and after calibration is made.Test proves that the calibration method of vehicle-borne mobile 3D measurement system proposed in this paper can effectively improve the precision of the system.