At present,the global climate models have some limitations on the ability to simulate and hindcast the climate characteristics of the East Asian monsoon region,as well as the complex terrain.The numerical simulation and prediction using the fully coupled model is a promising method in the study of climate change.Coupled Model Intercomparison Project Phase 5(CMIP5),includes a fully coupled model of decadal return testing,which is the latest version of the major international advanced models,much better than the previous model.The return performance of the model is mainly reflected in two aspects:climate mean and climate variability,in which the model of climate change can be reasonably rewarded in order to predict the future climate effectively.Most of these studies focused on the assessment of climate change trends and climate averages.Ensemble forecasting can effectively cope with the uncertainty of model prediction.Some studies have pointed out that the multi-model ensemble has more reliable simulation ability than the single model in the contemporary climate of East Asia.BMA is a pre-processing method of ensemble forecasting,which can provide more accurate prediction,and studies have shown that BMA is better than simple multi-mode ensemble average.Based on the CMIP5 which runs of 10 climate system models for the surface air temperature hindcast,the multi-model ensemble(EMN) and Bayesian model averaging(BMA) prediction of the surface air temperature have been conducted.In terms of the variance distribution,the spatial and temporal distribution of the surface air temperature variation as well as the periodic oscillation characteristics,the skills of single models,EMN,BMA hindcasts are reasonably good by using EOF analysis and Morlet wavelet analysis.The results show that each single model,EMN and BMA can hindcast the variance distribution quite well for the period of 1981-2010.Among them BMA provides the best hindcast.EOF analysis indicates that each single model,EMN and BMA can hindcast two leading modes of the surface air temperature anomalies over East Asia.The models MIROC5 can not only hindcast the trend,but also hindcast the detrended variability fairly well.Although most single models and their multi-model ensembles are able to hindcast the trend of the surface air temperature over East Asia,it is still difficult to hindcast the interannual and interdecadal variability.Wavelet analysis suggests that CMCC-CM model systems can hindcast the quasi-quadrennial oscillation reasonably well,which is associated with that of the NCEP data.Multimodel ensemble mean and BMA are not able to hindcast the periodic variation characteristics of the surface air temperature principal components.