Present research paper is an attempt to examine the dynamics of snow line by using Normalized Difference Snow Index (NDSI) in Gori Ganga watershed, Kumaun Himalaya, Uttarakhand (India). For the study of detect snow line used of Landsat satellite imageries of three different time periods like Landsat TM of 1990, Landsat TM of 1999 and Landsat TM 2016. Geographical distribution of snow line average height reveals that in 1990 about 4665.02m, 1999 about 4764.97m and in 2016 about 5068.95m average height of the Gori Ganga watershed. These data suggest that due to global warming about 403.93m snow line average height of Gori Ganga watershed has been shifted into non-snow cover area at an average rate of 15.53m/year during 1990 to 2016.