Abstract: Aiming at the problems of poor repeatability and low accuracy of the RTCP parameter calibration method for five-axis machine tools, a method to correct the RTCP parameters based on the RTCP kinematic model is proposed. The least square method is used for preliminary calibration, and the preliminary calibrated RTCP parameters are compensated into the system to verify their accuracy. Finally, the preliminary calibrated RTCP parameters and the actual machine tool structure parameters are combined with the RTCP kinematic model for simulation. The error of the RTCP parameters is inferred from the error of the relative position between the trigger probe center and the standard ball center, and the accuracy of the preliminary calibrated RTCP parameters is corrected. After a multiple of experiments, the radial error after kinematic model correction is less than 0.01 mm, compared with 0.01-0.10 mm before correction, the accuracy has been greatly improved.