Abstract: In order to study the effect of channel code technology on bit error rate (BER) performance of wireless optical communication subcarrier systems, based on noise characteristics of wireless optical communication, atmospheric channel model was found. Low density parity check(LDPC)code was introduced as the channel code in wireless optical communication, the error rate of wireless optical communication using subcarrier modulation was simulated under different scintillation distribution, and the BER performance between LDPC code coded and uncoded systems of binary phase shift keying (BPSK)and quaternary phase shift keying(QPSK)system was compared. The simulation results show that error performance of the BPSK system is better than that of QPSK system, and LDPC code has excellent error correction capabilities with a larger coding gain, and has some applicable values in the field of wireless optical communication.