Three typical forest types(Korean pine-spruce-fir forest,spruce-fir forest,and birch forest)in Fenglin national nature reserve of Xiaoxing'an Mountains were chosen as research objects,and the representative sections of each forest type were selected to establish sample plots.We measured the snow depth,snow density and snow water equivalent of snowfall and snow cover inside and outside forests by using snow slot,snow bridge and snow gauge,and compared the processes of snowfall,snow cover and snow melting inside and outside forests.The results showed that due to the influence of leaf area index(LAI),the interception of snowfall and snow retention rate of 3 forest types listed in the following order:spruce-fir forest>Korean pine-spruce-fir forest>birch forest,while the maximum snow depth listed in the following order:grassland outside forest>birch forest>spruce-fir forest and Korean pine-spruce-fir forest.The accumulated snow inside and outside forests started to melt in early February,and in mid-March,snow ablation rate accelerated.The snow melting duration could last up to 60 days in evergreen spruce-fir forest and Korean pine-spruce-fir forest,which was 5 to 20 days more than snow melting duration in grassland and broadleaved birch forest.In addition,the snowfall and snow cover density in forests(0.113 g/cm~3)were less than those in grassland outside forests,but the differences were not significant(P>0.05).In conclusion,the snow hydrological processes were apparently different inside and outside forests and were also different among different forest types. Forests,especially evergreen coniferous forest,could intercept snowfall and prolong the process of snow melting, which probably related with the influences of leaf area index or crown density,and might also related with the canopy structure,climate change,terrain factors,snow characteristics,and so on.