Based on the NCAR CCM2 and IAP/LASG OGCM,a new air-sea coupling scheme called as the "flux reanalysis coupling scheme(FRAC)" is designed by using the EOF theory,and a coupled Ocean-Atmosphere Model System(NIM/COAMS) is established.This scheme can filter the high frequency parts of component model fluxes caused by non-linear air-sea interaction,and maintain the principle parts of model flux fileds,thus preventing the rapid amplification of model errors.Simulated results show that the coupled model is able to control effectively climatic drift for steady long-term integration in such a way that in the first model decade the global mean SST rises only by 0.1℃ and the global mean surface temperature only by 0.3℃.And the 50-year integrated results show that the simulated climate basically accords with the observed,and some results are better than those simulated by the uncoupled models.