In the laser aiming process at far-field atmosphere,the atmospheric turbulent will result in beam spreading and wandering and the pointing accuracy of a laser is dropped seriously.Based on the modified Von Karman turbulence spectrum and the theory of partially coherent beam propagating, a light field simulation software of Gaussian beam propagating though atmospheric turbulence was developed, and the transmission characteristics of beam propagating through far-field strong atmospheric turbulence were investigated in a certain meteorological condition.A test system with a laser optical axis in beam diameter less than 9 mm and a large-calibre receiving lens in 120 mm was designed for measuring the dynamic aiming deviation.At the same time, the relationship between the beam spreading and the variation of gravity center of laser spot was investigated in the range of 3 km and the influence of the beam spreading on laser aiming accuracy was analysed.Based on above results,the compensation scheme for aiming deviation can improve the laser aiming accuracy in an atmospherical visible range of 10 km.When the laser transmission distance is less than 3 km and the angles of elevation are 0~45°,the deviation error of a laser spot is equal to or less than 0.1 mrad.