Sanwei Mountain is located in the southeast of Dunhuang, the main peak is facing the Mogao Grottoes. Sanwei Mountain is known as the root of Mogao Grottoes. The ancients built Mogao Grottoes because they saw Buddha light in Sanwei Mountain. Now, it is still the first of the "Dunhuang Eight Views", called "Dunhuang Dongshi". The three peaks of Sanwei Mountain stand tall, looking like it is about to fall, as if it is about to fall, so Sanwei Mountain is also known as the first mountain in Dunhuang. Now, Mogao Grottoes are famous in the world, and Sanwei Mountain has become unknown. Now this is already a national scenic spot.