San Gong Shan Bei is one of the most valuable inscriptions in the history of books. Han Yuan four years (1 17), seal script, 10 line, 17-20 characters. Existing in Longshan, Yuanshi County, Hebei Province. It is in the southwest of the main peak of Huashan, with an altitude of 2000 meters, facing the main peak of Huashan across the valley. Because there is a rectangular boulder standing on the three peaks of the mountain, its shape is like an old man standing on the main peak of Huashan Mountain on three sides, hence the name. Wei Guangxu, governor of Huguang in the Ming Dynasty, recorded in China's Travels that the southern peak is extremely high, and there are three peaks outside the valley, which are as high as the southern peak and are called Sangong Mountain. There are two Sangong Mountains, with a thousand peaks like a violet petal supporting the main peak of Huashan Mountain.