The high altitude atmosphere turbulence is described by the “Clear 1” refractive-index fluctuant turbulence model. The aero-optics effects model of the high altitude turbulence channel was established,and the relation of beam spot size,flight altitude,wavelength and transmission distance was analyzed. The changes of scintillation factor with receiver aperture and flight parameters were discussed in the gamma-gamma atmosphere turbulence channel. The results show that:①spot size increases under the effect of aero-optics,and spot size in the low altitude is larger than that in high altitude；②spot size increases with the increase of wavelength,and spot size at wavelength of 800 nm is most effected by the aero-optics；③scintillation index only relates to the receiver aperture,and it gradually increases with the increase of transmission distance；when the scintillation index exceeds 1,it increases slowly and reaches the peak value gradually.