Double Ninth Festival, also known as Double Ninth Festival, Sunbathing Autumn Festival and Treading Autumn Festival, is a traditional festival of Han nationality. Celebrating the Double Ninth Festival generally includes activities such as traveling to enjoy autumn, climbing high and looking far, watching chrysanthemums, planting dogwood all over, eating double ninth cake and drinking chrysanthemum wine. Every year, the ninth day of the ninth lunar month, New Year's Eve, Tomb-Sweeping Day and Zhongyuan Festival are collectively called the four traditional ancestor worship festivals in China. The Double Ninth Festival was formed as early as the Warring States Period and was officially designated as a folk festival in the Tang Dynasty. From generation to generation. Chongyang and the "spring outing" on March 3 are all family members, and all relatives of Chongyang should climb the mountain together to "avoid disaster". When it comes to the Double Ninth Festival, Wang Wei's poem is widely known: "Being a stranger in a foreign land, I miss my relatives twice every festive season".