This　paper　presents　a　multi-pulse　laser　radar　system　and　target　detection　algorithm　for　motion　target　detection.　In　this　paper,　the　system　of　multi　pulse　lidar　is　introduced　firstly,　and　the　detection　performance　of　the　target　range　is　analyzed　by　combining　the　lidar　equation.　Then,　aiming　at　the　detection　of　the　moving　target,　the　influence　of　the　target　tangential　velocity　and　the　radial　velocity　on　the　multi-pulse　echo　accumulation　is　deduced,　and　the　conditions　of　the　effective　accumulation　of　the　multi-pulse　echo　are　given.　The　constraints　of　the　multi-pulse　laser　radar　target　detection　system　on　the　parameters　such　as　the　irradiation　frequency　and　the　emission　pulse　width　are　pointed　out.　Then,　a　multi-pulse　laser　target　detection　algorithm　and　its　implementation　steps　are　proposed,　and　the　simulation　results　are　given.　The　experimental　results　show　the　effectiveness　of　multi-pulse　laser　for　target　detection　under　low　SNR.