Double Ninth Festival, the ninth day of the ninth lunar month, is called "Double Ninth Festival". There are six yin and nine yang in the Confucian view of yin and yang after Hanzhong Ye. Nine is the yang number, and the solid weight nine is also called "Chongyang". People have the custom of climbing on that day, so the Double Ninth Festival is also called "Climbing Festival". There are also sayings such as Double Ninth Festival, cornus and Chrysanthemum Festival.

In addition, the homonym of "Jiujiu" on the ninth day of September is "Jiujiu", which has a long-lasting meaning, so it is often used to worship ancestors and carry out activities to respect the elderly. The Double Ninth Festival and the three festivals of "Chu", "Qing" and "Yu" are also the four major festivals for ancestor worship in traditional festivals in China. Only in recent years, people have paid more attention to the elderly, so the festival is also called the festival for the elderly.

The Double Ninth Festival, which falls on the ninth day of the ninth lunar month, is a traditional Double Ninth Festival, also known as "Old People's Day". Because the Book of Changes defines "six" as the yin number and "nine" as the yang number, on September 9, the sun and the moon merge with yang, and the two nine are heavy, so it is called Chongyang, also known as Double Nine.

The Double Ninth Festival was formed as early as the Warring States Period. In the Tang Dynasty, Double Ninth Festival was officially designated as a folk festival, and it has been followed since then. Double Ninth Festival, also known as "Treading in Autumn" and "Treading in Spring" on March 3rd, is a family affair. On this day, all relatives of Double Ninth Festival should climb the mountain together to "avoid disaster", insert dogwood and enjoy chrysanthemums. Since Wei, Jin and Chongyang, the atmosphere has become increasingly rich, and it has been one of the most traditional festivals sung by literati in past dynasties.