A heave rain event appeared in the middle and southern area of HeBei Province accompanied with storm surge in Bohai Bay on 11th October 2003. This was very rare in North of China in autumn. Based on the MM5 and Doppler radar data, the event is analyzed. The results show that (1) MM5 is better in simulation of steam field, sea-level pressure field and precipitation. (2) The permanence of eastern wind over Bohai sea resulted in the heap of sea water and the rise of sea level. Folding with chronometer strong tide, the storm surge occurred. (3) The thick layer of E—NE wind near the surface in the period of storm surge was increased, and the meantime precipitation was decreased.