Abstract: Based on the precipitation data of 232 regional meteorological stations, 6 national meteorological stations, and ECMWF forecast situation data from 2015 to 2017 in Yueyang City, the spatial distribution characteristics of rainstorms in recent three years and the impact systems of rainstorms in the middle and lower levels were analyzed by using statistical methods, synoptic principles, and mesoscale analysis techniques. The results showed that the rainstorm mainly occurred in the eastern mountainous area of Yueyang City. Yaogu Mountainous area was the area where the rainstorm was most prone to occur and the intensity of the rainstorm was the largest. Lianyun Mountainous area was also the area where the rainstorm was prone to occur and the intensity of the local rainstorm was great. The topography was an important factor for the frequency and intensity of the rainstorm in Yueyang City. Climate system was the trigger of the rainstorm. The climate systems affecting the rainstorm in Yueyang City included low eddy jet type, low eddy shear type, jet convergence type, warm shear influence type, shear control type, shear eastward-moving and southward pressure type. The low eddy jet type usually corresponded to large intensity and wide range of precipitation, mostly urban rainstorm or torrential rain. The jet convergence type usually resulted in large, mostly regional rainstorms or torrential rainstorms. The shear control type usually resulted in rainstorms with large intensity, large concentration, and large scope, mostly regional rainstorms or trans-regional rainstorms. The low eddy shear, shear-eastward-moving and southward pressure types usually corresponded to rainstorms with large intensity and concentrated scope, mostly regional rainstorms. The warm shear influence type was usually associated with rainstorms with large intensity and small scope, mostly regional rainstorms.