Abstract:A climatology is developed for tornadoes during 1971–2020 in Liaoning. Tornado reports are from the "Chinese Meteorological Disaster Dictionary", "Chinese Meteorological Disaster Yearbook" and other related data. The climatology includes interannual variability, annual and diurnal cycles, intensities according to the “Enhanced Fujita Scale”, geographic distribution, and environmental conditions derived from model analysis data. Given the study results, (1) Over the 50 years, there were 105 tornadoes recorded(Including 17 tornadoes above EF2) in 97 tornadic days with a mean of 2.1 tornadoes annually and 0.14 tornadoes per year per 10000 km2,about 1/10 of the United States. Tornadoes occurred with a maximum(95%) from May through September. 67% of tornadoes genesises in the diurnal variation are between 14:00 BT and 19:00 BT. Significant tornadoes mainly occur in the central and west Liaoning, and more of the tornadoes occur in southeastern coastal area weak tornadoes. The tornadic season in the northwest of Liaoning is significantly earlier than the southeast.(2)CAPE and mid-level wind shear is inversely phase changes with the seasons, which makes the appropriate configuration of the two be prerequisites. The lower low-level storm relative helicity in climate state is the main reason for the apparently lower tornado density in Liaoning than in the United States.(3)87% of tornadoes are related to cold vortex, which are mainly divided into short wave trough category at cold vortex bottom and cold vortex front category dominated by low-level frontogenesis (65%) , mid-level dry cold air forcing category dominated by mid-to-high level dry cold air flow(12%), and the cold vortex central area category dominated by meso-scale near-storm environment under severe thermal instability (6%). The characteristic field of typical tornadoes in Liaoning shows that: the comprehensive configurations of cold vortex at middle-level; high wind speed core and relative storm helicity at low-level; CAPE gradient large value area; cold front, warm temperature ridge, and dry line at surface are important indications for tornado-prone areas in Liaoning.(4)The environmental conditions in the high-incidence area of Liaoning tornadoes have the following characteristics:the mid-level system is cold vortex, the ground corresponds to frontal cyclones, tornadoes often appear in the northwest quadrant of the center of SRH, and in the large value area of CAPE gradient, corresponding to the front side of the ground cold front1 ~2.5 latitudes, the top of the temperature ridge, and 1~1.5 latitudes on the east side of the dry line.