To meet the technical requirements of the laser fuze precision ranging,a mathematical model of the target echo signal is established,and Matlab is used to simulate the forefront identification,constant ratio identification and peak detection in the traditional ranging algorithm.Based on these studies,A method of ranging based on modulus maxima of wavelet transform is proposed.Through the error simulation analysis,the advantages and disadvantages of the four algorithms are compared.The results show that wavelet transform method is obviously better than the traditional algorithm,and the range error can be controlled in centimeter order.