Abstract: Based on conventional meteorological observation data,ERA5 reanalysis data,TBB data and radar data,the characteristics and causes of two rainstorm processes in Liaoning on July 6 (process 1) and July 28 (process 2) in 2022 are compared and analyzed.The results show that the high-altitude trough at the bottom of the cold vortex,subtropical high pressure and the surface cyclone are the main affect system of two processes.Process 1 exhibits dual rain band characteristics,while the main rain band in Process 2 is located in western Liaoning.The high-altitude trough guides cold air southward and produces frontal precipitation,which is the main cause of Western-Liaoning rain belts.In Process 1,the southern trough of the subtropical high quickly passes through,and the coupling of high and low level jets provides strong lifting motion.The vertical velocity at 700 hPa reaches -9 Pa·s^-1,and the low level jet transports water vapor,the water vapor flux at 850 hPa reaches 33 g·cm^-1·hPa^-1·s^-1,resulting in a narrow but strong rainfall belt in western Liaoning.The Liaodong rainfall belt is the result of the joint action of the warm zone and the front,with high energy and high humidity at the top of the cyclone trough,at 850 hPa θ_se reaches 354 K,after the front zone moves eastward,a strong water vapor convergence zone is formed on the left side of the low-level jet exit zone.In process 2,the low-level jet is weak,and there is no strong divergence field in the high altitude,the water vapor transport and uplift conditions are not good.However,the eastern obstruction situation causes the high altitude trough oscillating in western Liaoning for a long time,resulting in a large but weak range of the main rain belt.In process 1,secondary circulation is formed on the windward slope in front of the mountain.In process 2,the low level mountain front still maintains a certain upward movement,under the condition of weak divergence field at the upper level and the weak water vapor condition,causing rainstorm points in the area,indicating that the terrain in front of the mountain has a role in supporting the upward movement.