Ground observation data of snow from 1999 to 2008 are used to analyze the temporal and spatial distribution of snow density in China. The maximum monthly density moves from north to south from October to the following January, and then moves back from south to north from January to April. The maximum density takes place at the border between Hunan and Jiangxi provinces in January, where the duration of snow cover is short and varies remarkably. The snow density in Northeast China and Xinjiang Region is also high, where duration of snow cover is long, with less density variation. Nine stations were selected to study the changes of snow density in Northeast China and Northwest China. It is found that there is a stationary phase of snow density from the middle ten days of November to the following February and a non\|stationary phase from October to the first ten days of November and from March to April. In order to further investigate the impacts of climate factors on snow density, the correlations between snow density and precipitation, air temperature, snow depth and wind velocity were analyzed in Northeast China and Northwest china, respectively. In Northwest China and Northeast China snow depth is the main contribution to snow density.