By using conventional meteorological data, FY-2E black-body temperature (TBB) data, Doppler radar observations, and NCEP/NCAR 1°×1° reanalysis data, three snowstorm processes in Jiangsu Province from 3 to 4 (“01·04” process), from 24 to 25 (“01·25” process), and from 27 to 28 (“01·27” process) January 2018 are comparatively analyzed. The results are listed as follows. 1) The three snowstorms are all caused by the joint influence of upper-level trough at 500 hPa, shear line at middle and lower level, southwest jet stream at 700 hPa, and surface cold air. During the snowstorms, water vapor mainly comes from the middle level and inversion stratification persists. 2) There are differences between the three snowstorms. In the “01·04” process, the warm and wet air flow in the upper level is formed in advance with better water vapor condition, and then the weak cold air wedges in from the lower level, which prompts the warm and wet air to rise, so the upward movement is stronger. In the “01·25” process and “01·27” process, the cold air cushion is formed first at the lower level, and then the warm and wet air in the middle level is intensified and climbs along the cold air cushion, which is much colder. In the “01·25” process, the temperature inversions is stronger. 3) The stable low value period of TBB during rainstorms can basically reflect the heavy snowfall period. Weak convection develops in the “01·04” process, which causes intensified snowfall.