At present, in the application of laser scanner, the most popular method to deal with the multiple echoes is sampling by high speed A/D first and then handling with complex algorithm. Because of the A/D chip is very expensive and it is hard to design, a new method is proposed. Firstly, an A/D sampling circuit design method is described. Then, a new circuit composed of comparator, time delay circuit, pulse generating circuit, pulse width measurement circuit, added circuit and Field Programmable Gate Array(FPGA) is proposed. This method is proved effective in dealing with two pulse echoes by experiment. This circuit costs less and is easier to design compared to A/D sampling circuit.