Abstract: A process of the heavy rainfall on 19-24 June 2005 in the Guangdong province was analyzed using the reanalysis data of NCEP and the special observational data including automatic meteorological observing stations data and satellite images. The results indicate that successive heavy rainfall occurred under favorable large-scale circulation backgrounds, including the strong divergence on the fore-edge of the South Asia High in the upper level, the Hetao bloking in the middle level, the low vortex shear line in the low level over the Changjiang Huaihe River valley, and the lowlevel jet, which transferred the abundant vapor from the Bengal Bay and South China Sea to the southeast of South China. Five strong convective rainstorm processes had close relationship with the developing and weakening of five meso α scale convective systems, respectively. And meso α scale temporal evolvement of dynamical condition in the precipitation area had a tight relationship with the change of upper-level jet and low-level jet. The automatic meteorological observing station data and satellite images show that the five heavy rainfall processes were consisted of nineteen meso β scale rain cores within nineteen mesoβ scale cloud clusters. The precipitation mainly appeared in mesoscale shear lines or convergence lines, and mesoscale vortices or convergence centers. The precipitation in the mesoscale eddy resulted from the “train effect” produced by successive passages of several mesoγ scale convective cells, and the mergence and intensification of squall lines with several meso γ scale echoes caused the convective precipitation in the vicinity of shear lines. The moving speed of the heavy precipitation areas in the warm shear lines was slower in comparison with that of the rainstorm in the cold shear lines, while the heavy rain in the convergence centers developed at first and then weakened stationary when the centers evolved into shear lines.