With its advantages of strong anti-interference ability,high resolution and good concealment,laser radar has been widely used in precision measurement,reconnaissance surveillance,fire control guidance and other fields. Aiming at the reality that echo signal is weak and difficult to detect in the long distance laser speed measurement and ranging,a new dual-frequency laser speed measurement and ranging method is proposed,which uses pulse compression technology to detect the signal. The principle of this method is analyzed and verified by experiments.The results show that this method can measure the spee and distance of moving targets.