Abstract: Using perturbed physics method ,a short range ensemble forecasting system based on Weather Research and Forecasting(WRF)modcl was built for southeastern China.The forecasted results of May and June 2010 were verified against the upper-level fields from National Centers for Environmental Prediction Ulobal Data Assimilation System and surface observations from more than 1000 stations(including base stations, basic stations and general sta- tions)in the forecast domain. An analysis of how physical parameterization schemes and ensemble mean approach af- feet the forecasting performance was done.The results showed that WRF model performed fairly well in forecasting the meteorological fields in southeastern China. For the whole forecast period(60 h)，the ensemble forecast system had certain skill in precipitation forecasting,judging from the performance of model members and ensemble mean. Meteorological elements at different pressure levels and precipitation at different thresholds were different in sensi- tivity to physical parameterization schemes and forecasting performance. For most meteorological fields，ensemble mean performed better than single model member.