Exemplified by the National Stadium，this paper probes into the influence of the construction of key projects on the periphery areas and the technology of land-cover change based on the object-oriented method. Selecting two images of the National Stadium in 2001 (before the construction) and in 2005 (the intermediate stage of the construction) and using multi-scale segmentation and object-oriented classification method，the authors carried out the land use information extraction and a comparative analysis of the land use change information resulting form the National Stadium construction. The results show that: （1） the ideal land cover classification results were obtained by using the object-oriented method, with the overall accuracy being 93.23% and 94.55% and the coefficient of Kappa being 0.915 8 and 0.933 2, which make up the foundation for rapid and accurate acquisition of land cover change information; （2）the construction of the National Stadium had a significant influence on periphery areas, as shown by the obvious change of vegetation, roads and cultivated land. Grasses and roads increased obviously while the cultivated land was reduced remarkably.