Abstract: By using conventional meteorological data，the precipitation data of automatic weather station，cloud data，and radar data，the heavy rain process on the Jiang-Huai cyclone in 2013 in Jingmen is diagnosed based on the weather dynamics．The result shows that:(1) There is the eastward propagation of trough from the high latitude，positive advection of vorticity which makes the southwest vortex strengthen，the decrease of the pressure which cause the Jiang-Huai cyclone．The Jiang-Huai cyclone move east and develop which cause the heavy rain．(2) The two strong rainfall periods are relative to the southwest vortex's strengthening and going east，the generation of Jiang－Huai Cyclone．(3) The rainfall belt is well coincident with the regions of strong upward motion．The development of the maxima of convergence of moisture flux is related to the heavy rain．(4) The thermal wind temperature advection inversed by wind profile radar，the maximum of atmosphere refractive index and the track prediction of the strong convective clouds by SWAP，have important significance on the location of local strong precipitation．