The simulation and analysis of the laser pulse echo signal are very useful to study different kinds of echo signal processing approaches and produce 3-D laser simulated images for target. In this study,the uniform time propagation and spatial distribution models of the emitted laser pulse were built. The reflected signal from the laser pulse sent at the laser imaging simulation template arising from 3-D target model could be calculated as a convolution sum between the impulse responses and the emitted pulses for the subareas in the laser footprint. The simulation analyses show that the ranging error caused by the simulation approximations is minor,and the better simulation precision of the echo signal is achieved in coordination with high simulation efficiency by adjusting the number of the subarea in the laser footprint.