Small glaciers are very sensitive to climate change， and monitoring and quantitative assessment of this type of glacier changes can help to understand the magnitude and mechanism of glacier response to climate change. In this study， we combined multi-source remote sensing data （satellite and UAV data） and meteorological data to analyze the change in area of Kuoqionggangri No. 1 Glacier in the Nyainqêntanglha Mountains， Qinghai-Tibet （Xizang） Plateau over the past 50 years， and quantitatively evaluated the magnitude of recent elevation changes and the spatial distribution of Kuoqionggangri No. 1 Glacier. The study shows that the area of Kuoqionggangri small cirque glacier shrank from （1.444±0.013） km² to （0.712±0.001） km² during 1968—2021， with a shrinkage of 50.7%， and the average rate of glacier terminus retreat was （6.23±0.71） m⋅a^-1. Based on the high-precision UAV survey data from 2020 to 2021， we found that the average elevation difference of the ice surface of Kuoqionggangri No. 1 Glacier reached （-2.41±0.69） m⋅a^-1. The average ice surface elevation change at the glacier terminus was greater than 3 m， and a decrease in the central part of the glacier in the range of 1.5 to 3 m. The study also found that glacier supraglacial streams play an important role in the spatial variation of elevation. There are 13 supraglacial streams developed on the surface of this glacier， and the average offset of the streams to the northwest from 2020 to 2021 is about 2 m. Downward and lateral erosion of the supraglacial streams resulted in causing significant spatial differences ice elevation changes at the glacier terminate.