Abstract: By taking the landsat series of remote sensing images from 1992 to 2018 as the data source, four indicators of greenness, humidity, heat, and dryness were calculated respectively, and the remote sensing ecological index (RSEI) was synthesized through the method of principal component analysis to study and analyze the ecological environmental quality and change characteristics of Wuyishan National Park, and the ecological environmental quality of Wuyishan National Park was comprehensively analyzed and evaluated. The results showed that the greenness and humidity had positive effects on the regional ecological environment, and the humidity had the greatest effect on the environment. The overall ecological quality of the study area showed a downward trend and then an upward trend. The RSEI value reached the lowest in 2008 and then gradually improved, but the overall ecological environmental quality showed a slight downward trend.