A snowmelt process in snowpack was discussed from the investigation results of snow type profile, water quality profile and volumetric water content profile at Mt.Gassan in Yamagata prefecture. At the snowpack on a slope, the vertical channel in snowcover was observed at the lowest level region in snowpack. At this channel, the snow type was granular snow and snow color was black-like and conductivity was 2-4μS/cm. The horizontal channel in a snow cover was observed as a ice layer at the other slope site. At this ice layer, ion storage and ion release was recognized at the same investigation period. The detail profile of the volumetric water content, w, in snowpack was measured by TDR method. The value of w in channel such as a ice layer and a granular snow showed from 10 to 32% and the value of w in non-channel such as a compacted snow showed from 0 to 3%. There is a clear difference between them, so it is useful to investigate the snowmelt process in a snowpack.