The Fokker-Plank equation for probability density of the arrival-angle fluctuations,which is Statisfied with the Ornstein-Uhlenbeck process, is derived by making use of the Markovian random process approximation for arrival-angle fluctuations and geometrical optics approximation for laser propagation in atmospheric turbulence. The Rician probebillty distribution density function of the arrival-angle fluctuations that relies on the propagating distance is obtained.A discussion of the Statistics of the intensity fluctuations caused by the angle of arrival fluctuations of a narrow laser beam was given.