Angle-tracking errors of semi-active laser guidance caused by atmospheric turbulence were calculated according to log-amplitude variance induced by intensity fluctuation and angle-of-arrival variance induced by phase fluctuation,and influences on pointing accuracy of semi-active laser guidance caused by the angle-tracking errors were simulated by using special software.Calculation and simulation results show that the tracking errors induced by atmospheric turbulence reach dozens of micro-radians,and result in the pointing accuracy of the guided system dropping by 10% or so.