The cold airstream snowfall weather events occurring in Shandong Penin sula have different characteristics from other precipitation processes. Two cont inuous heavy snowfall courses in northern Shandong Peninsula in December 2005 we re analyzed. It can be seen from the conventional radar data that the top layer of echo is 3 km, which reflects the low level characteristics of cold airstream courses. The simulation results by WRF mesoscale numerical model show tha t the cold airstream weather has a close relationship with the structure of low level atmosp here. The cold airstream of 850hPa layer has a positive correlation with ground precipitation. Vertical distributions of cloud water, cloud graupel water and ve rtical velocity further approved the low level characteristics of cold airstream precipatition.