Abstract: Comparing the different vorticity components on Wuhan to rrential rain in 1998,the results show that zonal shear vorticity has a corresponding connection with heavy rainfall center while the upper-negative shear vorticity develops and the low-positive vorticity increases.Analysis of case and statistics present that the develo pment of zonal shear vorticity over 200hPa is one day ahead of heavy rainfall occur rence.Meantime,the high apparentheat source(Q1)and moist sink(Q2)as well as strong ascending motiongo with torrential rainstage.The source center is located at 450hPa,and the sink center at 600hP a.Evidences suggest that the transportation term plays an import ant role in at mospheric diabatic heating processes.However,the local variation ter missmall and reverse to advection term in apparentheat source ver tical section,so it is of tenignored,butit cannot be neglected in moist sink.