The　precision　of　pulsed　laser　rangefinder　directly　depends　on　the　ability　to　measure　the　time-of-flight　(TOF)　interval　of　pulse　laser.　This　paper　proposes　a　new　method　to　improve　the　precision　of　distance　measurement　based　on　self-triggering　pulsed　technique,　adopting　a　professional　time-to-digital　conversion　(TDC)　chip　and　reducing　the　complexity　of　the　system.　In　addition,　by　comparison　with　the　traditional　methods,　this　method　can　achieve　higher　precision　and　has　good　stability,　which　is　suitable　for　high　performance　pulsed　laser　rangefinder.　©　2013　TCCT,　CAA.