The nine-story building is a building in Dunhuang Mogao Grottoes, built on the cliffs, is the middle of the Mogao Grottoes Shangsi Grottoes Group, 45 meters high, and the building is dedicated to the world's largest indoor cross-legged and sitting on the statue of Maitreya Bodhisattva. The nine-story building has undergone several reconstructions before and after, from the first only two floors, until the Republic of China period to the nine floors that everyone sees.