Abstract: In this paper, we evaluate regional geological environment stability of the Three Gorges area quantitatively, using global navigation satellite system (GNSS) and gravity continuous observation data, combined with hydrological meteorological and topographic data. The results are based on quantitatively detecting the influence of some environmental factors on the geological stability of different sites. We find out that geological environment of the Three Gorges reservoir area is generally stable, and the stability of the geological environment in the lower reaches of the Three Gorges Dam is generally good. However, there are 5 to 6 weak geological environment areas, with different shapes and areas along the Yangtze River in the Zigui-Yunyang section of the Yangtze River. There are also some areas with weak geological stability in Fang County and Zhenping County, outside the Three Gorges reservoir area. The quantitative evaluation method and results have important reference value for regional geological environment assessment and geological disaster prevention and control.