Using multi-source observation data including raindrop disdrometer data, the microphysical characteristics of the Jianghuai cyclone snowstorm (JHCS) and the sea-effect snowstorm (SES) that affected Shandong in December 2023 are analyzed. The results are shown below. (1) Compared to the SES, the cloud system of the JHCS has a higher cloud top height, a lower cloud top brightness temperature, and stronger convective intensity. (2) The JHCS has higher particle number concentration, narrower particle size distribution, smaller particle diameter, and larger snowfall intensity; the SES has lower particle number concentration, wider particle size distribution, larger particle diameter, and smaller snowfall intensity. (3) The distribution of particle terminal velocity of the JHCS is mainly unimodal, while that of SES is mostly bimodal; the particle terminal velocity and its width of the JHCS are larger than those of SES. (4) The JHCS contains more graupel, ice pellet, and snowflakes, while the SES is mainly composed of snowflakes and their aggregations. (5) There is a significant difference in the Z_e-I_s (namely equivalent reflectivity factor-snowfall intensity) relationship between the two snowstorm cases. When snowfall intensity is the same, the Z_e of SES is larger.