The original note of this poem: "That was seventeen years old." Explain that this is the work of Wang Wei's Seventeen Points. Wang Wei was wandering between Luoyang and Chang 'an alone. He is from Zhou Pu (now Yongji, Shaanxi Province), and Zhou Pu is in the east of Huashan Mountain, so he called his hometown brothers Shandong brothers. September 9th is the Double Ninth Festival, and some places in China have the custom of climbing mountains. The thirty-second volume of "Taiping Magnolia" quoted the story of local customs: "This day is established by convention and matured with the strong spirit of Cornus officinalis. On this day, the folded house is blocked to prevent early cold. "