Using the observation data and NCEP/NCAR reanalysis data, The characteristics of Plateau vortex shear in summer during 2008-2012, which moved southeastward to Yunnan Province resulting in heavy precipitation, are analyzed. The results show that these events are mainly divided into three types: the strong cold air behind plateau vortex shear, the supplementary of plateau vortex shear and the weakening southeastward plateau vortex shear. Among them, the third type produced the most of heavy rain in Yunnan. North-central Yunnan is the main area of heavy rain and the typical affected area of Plateau vortex shear in Yunnan, the rainfall in these areas mainly occurs at night. The first type has the largest influence area, which can cause rainstorm in whole province, but has less frequent. During the second and third type of events, the high (ridge) between Yunnan and Myanmar are maintained. Precipitation area and are related to the location of subtropical high、the meridionality of vortex shear and the time. There is obvious income of water vapor in Yunnan during the heavy rain; The meridional moisture income is stronger than the zonal moisture output. By using HYSPLIT model, the water vapor transportation of rainstorm are analyzed. The Bay of Bengal is the most important water vapor source. In north Yunnan, the contribution of water vapor from plateau is important. Some moisture over the Tibetan Plateau comes from the region to the Arabian Sea, the others from the Bay of Bengal. During the process of transport, every air flow might experience several periods of evaporation-precipitation in which it was influenced by terrain.