Abstract: Intensively observed data, such as surface data, sounding data and dual-Doppler data, which were obtained during the "973" intensive observing period in 2002, were used to analyze two types of heavy rain processes that occurred in Hefei, Anhui Province. Two examples in the background circulation were analyzed in terms of the vertical structure of physical quantities, characteristics of dual-Doppler base reflectivity and velocity. The result shows the followings. First, the cold shear is very similar to the warm shear type of heavy rainfall in vertical structure of the physical quantities, in that the maximum value of water vapor horizontal convergence is at 850hPa, low-level convergence goes with upper-level divergence, and positive vorticity at low level pairs with negative vorticity at upper level, though with some differences in the allocation and intensity between low and upper levels, which is especially obvious in the water vapor flux. Warm shear is more favorable for the convergence of water vapor. Besides, the Doppler radar echoes characteristics had some differences. The VWP products could be used to monitor the real-time changes of vertical wind shear during heavy rains. And they are also useful in improving the capability of single-station heavy rainfall forecast.