Based on the analysis of the integrals theory with the modified Von Karman spectrum model and the Hufngel-Valley turbulence profile mode,the article combines a laser spot pointing error compensation system,and adequately using the laser spot far-field experiment data,the relationship between various transmission distances and the beam spreading in certain weather conditions is studied,and then the effect of beam spreading on the laser pointing accuracy were analyzed when the pulsed Gaussian-beam propagation though atmosphere turbulence.A scientific basis for the optimum design of the laser spot pointing error compensation scheme is provided.