提出了一种激光测速的新方法——半极性相关法，它既具有极性相关法中数字信号便于延迟的优点，又保留了经典相关法中不丢失幅度信息的长处。文中证明了半极性相关法与经典相关法具有相同的最大峰值点，并给出了初步的实验结果。 A new method of laser velocity measurement, semipolar correlation method, is proposed. It not only has the advantage of digital signal delay in the polar correlation method, but also retains the advantages of the classical correlation method without loss of amplitude information. The paper proves that the semi-polar correlation method has the same maximum peak value with the classical correlation method and gives the preliminary experimental results.