In this paper, designconsiderations and working style of data sampling and processing system for severaldecades nanoseconds laser reflective wave narrow pulse signal are provided. The system isdeveloped for building laser reflective characteristics mathematics model of target andbackground. In the design, the narrow pulse is expanded into 100μs square wave in its peak, in order to measure altitude ofthe pulse and sample continously for a long time. The sample is controlled by base signalor itself. The base signal or reflective wave signal is expanded into 5～50μs square wave and the sample is triggered by its riseedge. So the sample can be synchronized with transmitting. The effectiveness of samplingand storing is improved. Wherever target and background is in effective distance, pulsepeak can be sampled. Sampling precision is assured. Technical characteristics of thesystem are up to use request, and confirmed by field test.