Abstract: In this paper, continuous rainstorm process of Dongting Lake Area from 29 June to 1 July 2017 was analyzed by using hourly precipitation observation data from national and regional stations and NCEP reanalysis data. The results showed that: 1) The rainstorm occurred in the south side of the shear line and the left side of the jet stream axis; The subtropical high maintained stable, making the high and low air jet coupling and staying over the Dongting Lake Area; The fluctuation of the upper trough, the development of the middle and lower vortexes and their shear lines were conducive to the continuous rainstorm weather caused by the convergence of the warm and wet air flows along the shear lines. 2) From the perspective of water vapor conditions, water vapor in the Indian Ocean was the most important source of water vapor transportation, followed by Bangladesh bending, South China Sea and the Pacific Ocean; The enhancement (weakening) of 850 hPa water vapor flux had a good indication significance for the arrival (end) of heavy precipitation; In addition, the strong convergence zone (center) of water vapor had a good correspondence with the rainfall area. 3) The upper troposphere over the Dongting Lake was near the ridge line of South Asia high. The evolution of middle and low level jet had obvious influence on the development of rainstorm. The vertical upward movement and convergence and divergence configuration corresponded well to precipitation changes. 4) The train effect and the long duration of upwind zone were closely related to the strong rainfall in the upwind area.