Abstract: Understanding glacier flow velocity is crucial for revealing the response mechanisms of ice dynamics in high-altitude regions. However, in Southeast Tibet, studies on glacier motion remain limited in both temporal and spatial scales. In this study, we derived the surface velocity of the Zelongnong Glacier in Southeast Tibet using multi-source remote sensing images and feature-tracking techniques. By integrating topographic factors (slope and thickness) with 30-year averages of temperature and precipitation, we examined the glacier’s long-term flow characteristics. The results show that the glacier exhibits pronounced seasonal variations in flow velocity, with higher values in summer and autumn and lower values in spring and winter. Velocity is strongly influenced by slope and thickness and shows a gradual increase under global warming. Climate analysis further indicates that glacier flow variations are mainly controlled by seasonal temperature and precipitation, with precipitation effects showing a clear time lag. This lag is closely related to the infiltration and transmission of melt water to the glacier bed. Long-term observations highlight both the seasonal dynamics and the increasing long-term trend of Zelongnong Glacier flow. In addition, potential links between velocity anomalies and geological hazards are discussed. Overall, this study provides new insights into the impacts of climate change on glacier dynamics in Southeast Tibet.