The ancients also often used crossing the valley as a method of health care. There is a saying in the book of washing marrow that "eating less will make you happy, and eating more will make you live longer". It can be seen that the valley has the function of prolonging life; Biography of Historical Records and Liu Hou: "Zhang Liang is sexually transmitted, that is, he does not eat grain." It is said that guiding the valley is a method of treating diseases. Anyone who walks in the valley should insist on eating gas and omnivorous medicine bait except cereal and wheat meals.