In the far-field atmosphere and the aiming process of laser spot

as atmospheric turbulent results in beam spreading and wander

the pointing accuracy of laser is dropped seriously. Based on the modified Von Karman turbulence spectrum and the theory of partially coherent beam propagating though atmospheric turbulence

a light field simulation software of Gaussian beam propagating though atmospheric turbulence was developed

and the transmission characteristics of beam propagating through the far-field strong atmospheric turbulence are investigated when Gauss pulsed beams propagate in the far-field atmospheric turbulent in a certain meteorological conditions.A test system of the dynamic aiming deviation of laser optical axis

in allusion to the phenomenon of pointing bias

especially under different transmission distance was designed

and the relationship between beam spreading and the variation of gravity center of laser spot is investigated and the influence that beam spreading works on laser aiming accuracy is analysed. The study provides a certian basis for the optimal design of compensation package of laser spot targeting deviation.