Based on the NCEP(1°×1°) 6 h reanalysis data,synoptic diagnostic analysis on an abrupt heavy rainstorm between Yellow River and Huaihe River in the summer of 2004 was studied in terms of newly-introduced physical parameters.Results show that the horizontal kinetic term of frontogenetical function contributes most to the formation of rainfall front.The vertical profile of helicity over rainstorm area shows the opposite pattern,with positive and negative respectively in the low-middle-level and upper-level of troposphere.The local variation term is reverse to the advection term no matter for the apparent heat source(Q₁) and moisture sink(Q₂),the vertical transportation term plays a significant role in atmospheric diabatic heating,of which the center was found in the middle and upper levels of troposphere due to the condensation latent heat associated with the convective precipitation.Maxima of frontgenisis,positive helicity and strong heating area are consistent with heavy rainfall area very well.