Aiming　at　airborne　multi-pulse　laser　radar　target　echo　waveform　irradiated　by　the　nanosecond　pulse　width　laser,　the　geometric　section　ratio　feature　is　proposed,　which　is　insensitive　to　target　attitude　and　can　be　used　for　target　detection　and　tracking　combined　with　target　motion　state　information.　And　then,　the　feature　extraction　algorithm　is　given.　Firstly,　by　analyzing　the　relationship　between　target　waveform　and　target　features　based　on　the　laser　target　waveform　model,　it　is　pointed　out　that　geometric　section　ratio　of　laser　target　is　an　attitude　insensitive　feature.　Next,　for　the　separation　of　target　waveform　from　noises　without　distortion,　the　improved　Donoho　threshold　de-noising　algorithm　is　given　in　wavelet　domain　using　discrete　wavelet　transform,　the　target　waveform　sequence　length　is　obtained　with　wavelet　reconstruction　signal,　the　peaks　of　target　waveform　are　detected　through　first　order　and　second　order　difference　equations,　and　then　laser　target　scattering　center　and　geometric　section　ratio　can　be　extracted.　Finally,　the　performance　of　the　proposed　algorithm　is　verified　through　simulation　experiment.　In　the　test　with　airborne　multi-pulse　laser　target　simulator,　the　laser　target　multi-frame　matching　detection　experiment　is　developed,　using　the　features　which　are　extracted　by　the　algorithms　proposed　in　this　paper　and　combining　with　the　target　motion　state　information.The　multi-pulsed　laser　target　detection　become　more　reliable.　©　2017,　Editorial　Board　of　Journal　of　Infrared　and　Laser　Engineering.　All　right　reserved.