In this paper, two cases are introduced in which rainstorms occurred first in northwest Hunan Province, but the next day it had heavy rain in southeast Hubei Province in one case only. A statistic is made from April to September in the years of 2003 to 2006 to find out how seriously cloud clusters of rainstorm occurred in northwest Hunan Province would influence southeast Hubei Province. Applying grid data from ECMWF, six rainstorms took place in southeast Hubei Province have been composed while six events which rainstorms did not occur there have also been composed. Its discovered that there were quite a lot of differences in these weather elements between two events based on a compare study. The main differences lie in that the trough at 500 hPa was deeper, located farther and moved slowly, that there was an obvious LLJ at 850 hPa, and that there appears an obvious conversion from high energy zone to low energy zone in southeast Hubei Province.