The approach and procedure of aero-optic effects are analyzed based on Sutton model.The research emphasis is airborne optical platform for subsonic. Simulation results are used to analyze the characteristics of wave-front distortions of coherent light beam induced by turbulent boundary layer. The results show that the Strehl ratio descends 52%, and wave front phase difference σ2φ increases 375 times with the increasing of Mach number. When Mach number increases from 0.2 to 0.6, the ratio of fuzzy angle to optical diffractive limited angle θβ/θD increases 6%, and Mach number increases from 0.6 to 1,the ratio increases 44%.