To overcome the shortage of hard synchronization of the test pieces circumferential speed with the linear movement of measuring probe in the traditional gear pitch relative measurement, this paper introduces a new method based on PC and high-speed data acquisition system. 为解决传统齿轮齿距相对测量方法中存在的测量头直线进给和齿轮旋转速度同步困难的缺陷,提出一种基于微机和高速数据采集系统的齿轮齿距测量方法。