Abstract: A new scheme of reference atmosphere is introduced to modify the hydrostatic extraction of AREM dynamic framework in this paper. A representative storm case is selected to make post-prediction simulation experimentation to validate the effects of the modified model.The results show that this new extraction does better for strong precipitation prediction. There are good impacts on the range, intensity and central location of rainstorms and severe ones. The new extraction improves AREM’s forecast exactitude of meteorological factor fields, especially the prediction of temperature and zonal wind in the middle and low troposphere and low stratosphere has been more remarkably improved comparing with the non-revised model. A lot of simulations in flood season validate the results mentioned above. The new hydrostatic extraction is reasonable and effectual.