With the exploitation of the natural resources in Lancang River basin, multi rundle hydropower stations have been programmed to establish in this mountain canyon area. It is urgent to pay a special attention on the condition of the land cover, especially for vegetation plant cover in this mountain area. The state will close be related with the sustainable development of the local social, economic, and environment in this mountain area. In this study, we selected Manwan hydropower stations as typical research case, which is the first one of developed multi rundle hydropower stations in Lancang River basin. This power station has been completed in 1996. The mountain vegetation cover condition around the hydropower station has monitored by use of remote sensing technique. We map and analyse the construction of the mountain vegetation covers around Manwan hydropower stations. The result show that the mountain vegetation covers in this area is normal and better than the before the power is established. The application of monitoring by remote sensing technique used in this study solved the survey difficult of the environment factors in this mountain area. It also offsets the lack of factors on environment security. It provides a typical case study for other hydropower stations in another area in Yunnan province.