Based on the ECMWF(European Centre for Medium-Range Weather Forecasts) globe ensemble Prediction System(EPS),the forecasting performance on Eurasia blocking circulation in January 2008 when the freezing rain and snow storm occurred in South China were assessed and discussed.The results showed that the observed blocking frequencies during January 2008 were extremely high and the blocking frequencies forecasted by ECMWF decreased with the lead time increasing.The circulation forecasting verification showed that the performance of ensemble forecast was better than that of deterministic forecast when the lead time was longer than 6 days.So the advantage of ensemble forecast mainly lied in the mid-range forecast.The blocking predictability analysis indicated that the predictability during the decay stage was lower than that during the onset stage.In addition,the blocking occurrence probability can be obtained based on the ensemble forecast,and such information could be offered to the forecasters in advance.