The Qinghai-Tibet Plateau, one of the major lake distribution regions in China, has experienced a growing frequency of lake outburst events in recent years due to the impacts of climate change. In 2011, Zonag Lake, situated in the permafrost zone of the plateau, underwent a significant outburst, dramatically altering the surrounding lake environments and triggering a series of ecological, environmental, hydrological, and permafrost changes. This event also caused substantial morphological changes in several regional lakes. Using indicators such as area, perimeter, and shape index, this study quantitatively analyzes the morphological changes in Zonag Lake, Kusai Lake, Haidingnor Lake, and Salt Lake from 2000 to 2021. The findings indicate a clear two-phase pattern, with the 2011 outburst as the dividing point. Before 2011, the lakes exhibited relatively stable morphological changes, whereas from 2011 to 2013, all four lakes underwent rapid transformations. The responses of the lakes to the outburst varied, with Zonag Lake and Salt Lake being the most significantly affected, while Kusai Lake and Haidingnor Lake showed relatively limited impacts.