Climate change is affecting the runoff in the Three-River Headwaters region. Researchers analyzed data from 1965-2004 and found that temperatures are rising, leading to decreased runoff at hydrological stations. Precipitation has a positive impact on runoff, while potential evaporation has a negative effect. The influence of potential evaporation on runoff depth varies among the three rivers, with the Lancang River being the most affected. Overall, the study shows that climate change is altering the water flow in the region.