Turnout of Beijing-Shanghai high-speed rail was selected as the research object of turnout rail disease grinding.This paper analyzed the geometric relationship of grinding wheels/rails, and the dynamic characteristics of high speed train before and after grinding. The results show that the working edge of turnout rail appears to be angular, and double light band appears on the rail surface. The conicity of wheel/rail equivalent is not within the ideal range. When the train passes through the middle region of the turnout, the dynamic characteristics of the high-speed train are better improved, but when the train passes the front and the back regions of turnout, the dynamic characteristics of the high-speed train are not as good as that before being polished. It is suggested that the wheel/rail relationship should be fully taken into account in the grinding of high-speed turnout in addition to the rail surface diseases grinding.