Abstract:A novelmethod of double threshold detection is p resented. The method is not only suitable for detection of small target, but also fast to detect strong target. For a strong echo target, the cap ture time is shorter, the method improves the speed of the laser radar’s cap turing target. While for the weak target,with many correlation p rocessing, the target can be detected on real time, thismethod improves the laser radar’s detection ability for small target. External experimental results show that the method can imp rove the detection distance of the laser radar, and the head2on intercept cap ture distance can imp rove about 2~3 times.