With the intensification of global climate changing, the human and economic losses caused by snowstorms becomes higher and higher. Harbin, located in the north of China, has the geographical advantage of heavy snowfall, the density and the distribution of snow on the ground and roof were measured. In the aspect of snow density, the snow density on ground and roofs were measured. The snow is divided into three kinds, and the range of snow density is roughly determined. By comparing the two kinds of measurements on both fields, the effects of location, snow thickness and temperature on snow density are specified. Also, the differences of snow density on both ground and roof, new snow and old snow are got. The results show that the old snow density is greater than the new snow density. The snow density of the roof area is obviously larger than that of the ground area; the ground snow density increases with the accumulation of snowfall.