The WRF3.5.1 model is used to simulate a freezing rain process that occurred on 1 January 2011 in Guizhou Province. The atmospheric stratification and macro and micro cloud structures and cloud physical characteristics are analyzed. Results show that in Guizhou Province, the atmosphere above the freezing rain area (26°N-29°N) is characterized by a cold and partial "cold-warm-cold" temperature stratifications. There were no significant ice phase particles at the top; the freezing rain area corresponded to a relatively strong water vapor convergence center, and cloud droplets formed under the cold condition with abundant water vapor. These cloud droplets collided during their falling, and supercooled raindrops mainly formed during the warm rain process. Raindrops stayed supercooled and fell to the ground. When they were exposed to below zero degrees of objects or on the ground, freezing rain quickly formed.