关节式坐标测量机的关节零位偏差是由装配工艺误差引起的，对测头末端的空间位姿误差影响极大。本文在建立六自由度关节式坐标测量机数学模型的基础上，应用全微分、最小二乘法和迭代算法等数学方法，建立了关节零位偏差的线性标定算法，并通过计算机仿真计算验证了该标定算法的正确性 Knuckle joint CMM joint zero deviation caused by the assembly process error, the probe end of the spatial position error greatly affected. Based on the mathematical model of 6-DOF articulated coordinate measuring machine, this paper established the linear calibration algorithm of joint zero deviation by using the methods of total differential, least square and iterative algorithm, and verified by computer simulation Calibration algorithm is correct