Based on two digital elevation models(SRTM DEM and TanDEM X 90 m DEM), the spatiotemporal changes in the slope of glaciers in the Himalayas were analyzed, revealing the influences of moraine coverage, proglacial lake development, and supraglacial lake expansion on slope changes. The results show that the slope changes of glaciers in the Himalayas exhibit significant spatial heterogeneity. Since the 21st century, the overall slope of glaciers has become gentler, but in some local areas, the slope has become steeper, with the Central Himalayas experiencing the most dramatic changes. The downstream slope of moraine covered glaciers is significantly lower than that of non moraine covered glaciers, and the regional differences are obvious. The development stage of proglacial lakes has a significant impact on slope changes: proglacial lakes in the Eastern Himalayas have entered the mature stage, and the slope changes tend to be stable; proglacial lakes in the Central and Western Himalayas are still in the early development stage, and the slope changes are closer to those of land contact glaciers. Supraglacial lakes mainly develop in the gentler downstream areas, and moraine coverage provides favorable conditions for their formation, while the gentler slope further promotes the expansion of supraglacial lakes.