Vegetation is an important component of tourism attractiveness. Studying the change of Normalized Difference Vegetation Index ( NDVI) in scenic spots is crucial to the sustainable development of scenic spots. Taking Lushan Scenic Spots,the first batch national key scenic spots,as the research area,the trend analysis was used to analyze the spatial-temporal change characteristics of NDVI based on the nearly 30 years Landsat NDVI data. Then,the potential influence factors of NDVI change were discussed from the aspects of climate, topographic and tourism activities. The results showed that: for nearly 30 years,the NDVI in Lushan Scenic Area showed a downward trend in the overall fluctuations. Among them,the two periods of 1988-2001 and 2002-2017 showed a trend of decreasing first,but the end of the rally was lower than the beginning level. In terms of space,the regional distribution of NDVI decreased significantly around the major scenic spots and tourist routes, while NDVI increased significantly was in the high-density forest cover region. Among the influencing factors,for the climate factor,due to the limited region of the research area,the spatial distribution of temperature and precipitation was small,and the correlation between temperature and precipitation and NDVI was not significant. Climate factor was not the main influencing factor of NDVI changes. For terrain factor,higher elevation and slope was distributed with major scenic spots and tourist distribution,where the interference of human factors was relatively large,and the value of NDVI was relatively low. Compared with the shady-slope,the sunny-slope was more abundant in light resources. In addition,the shady-slope was mostly a region with strong human activities such as scenic spots and tourist routes,and the NDVI was higher in the sunny-slope. For tourism activities,with the number of tourists and tourism activities increased year by year during the research period,the construction land and bare land around scenic spots,visitor centers and tourist routes also increased significantly,leads to downward trend of NDVI. Tourism activities were the main influencing factors of NDVI changes.