Abstract: In this paper, subspace blind equalization algorithm of wireless optical communication using subcarrier modulation was studied based on Gamma-Gamma optical intensity scintillation distribution model. The constellations of the subcarrier multiple phase shift keying modulation signal through the atmospheric turbulence channel before and after the blind equalization was compared, and the bit-error-rate(BER) curves of the system under different scintillation distributions was given. When R=0.1 and SNB=20 dB,the BER was reduced from 4.710-1 to 1.5610-3. The BER performance was obviously improved. At the same time, measured data in two kinds of weather conditions(cloudy,rainy) which were described to atmospheric channel, was used in the experiment of subspace blind equalization. Clustering performance and phase identifiability of the constellation after equalization are obviously better than before equalization. The simulation results show that the subspace blind equalization algorithm has a good effects on equalization of subcarrier modulation signal under the atmospheric turbulence channel.