[Objective] The aim was to analyze one disastrous snowstorm process.[Method] By dint of routine data of weather,snowstorm process in Benxi which occurred from 08:00 on December 4,2009 to 08:00 on December 5 in 2009 was expounded from weather situation and numerical forecast aspects.[Result] North China cyclone supplied sufficient water vapor for this process in Bohai and Huanghai;the middle and low layer convergence of convective layer and high latitude divergence formed strong upward movement to supply fav...