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In order to better study the influence of propagation environment on the signal in OFDM system in dynamic multi-scenario, the OFDM signal in IEEE802.11g under complex environment is simulated. First of all, a mathematical model of the influence of high-speed mobile, multipath propagation and co-channel interference on OFDM signal transmission is set up. Secondly, based on the introduction of the OFDM transmission signal and reception model, the complex signals that IEEE802.11g equipment faces Environment. Finally, the influence of complex environment on the performance of OFDM communication system is simulated and analyzed. The results show that the complex environment of high-speed mobile, multipath propagation and co-channel interference will cause the degradation of OFDM system performance. The model not only can study the influence of complex environment on the performance of OFDM signal, but also can be used as the verification platform for the performance improvement of OFDM system in the future, which is of certain practicality.