By selecting turnouts of Xuzhou-Lanzhou high-speed railway as the research object and applying the personalized turnout rail grinding, this paper analyzes the grinding wheel/rail geometry characteristics and explores the dynamic characteristics of high -speed trains before and after grinding. The results show that, with personalized turnout rail grinding, the left and right side of the turnout rail are symmetrical, and the wheel/rail equivalent conicity is improved. Moreover, when the train passes through the turnouts, the peak value of wheelrail lateral force and the peak value of wheel-rail abrasion power are significantly reduced, and the train wheel/ rail force is improved. The peak value of load reduction rate, the peak value of derailment coefficient and the peak value of wheel/rail lateral movement are all reduced, and the train safety is significantly improved. When the peak value of the vehicle body transverse/longitudinal acceleration and the peak value of the frame transverse/longitudinal acceleration are decreased, and the stability of the train operation is improved.