Atmospheric attenuation has strong effect on optical signal, and scattering atmospheric optical communication system usually adopts receiving antenna to strengthen the signal collecting ability and increase its communication distance. The receiving angle and bottom radius are the determinative parameters of Compound Parabolic Concentrator (CPC). It is showed that CPC’s height will be taller and its light collecting ability will be stronger when CPC’s field of view is smaller at the same bottom radius. The ray tracing analysis shows that CPC’s field of view is wide and its gain is high. The light propagation of scattering optical communication based on multiple scattering was simulated by Monte Carlo method. The results show that using CPC as receiving antenna could strengthen the signal collecting ability of communication system and increase its communication distance. CPC is the suitable optical antenna for scattering optical communication.