In addition to putting colored flags on the Double Ninth Festival cake, people in some places in the south of the Yangtze River also put colorful paper flags of different sizes in front of their doors, which fluttered in the wind during the Double Ninth Festival and became a sea of flags.

Chongyang banner is one of the folk arts. Once the Mid Autumn Festival is over every year, people who are good at painting begin to draw various paper banners, open exhibitions or give gifts to relatives and friends. There are also poor painters who earn money for fighting rice. Flag paper is superior rice paper or historical paper, or square, or triangle, or rectangle; The size of the flags is also graded. The edges of the flags are inlaid with paper tassels, which are very beautiful. As for the contents of the paintings, there are "Eight Immortals crossing the sea", "Liu Hai playing with toads", "Seven Sages in the bamboo forest" and so on. There are also those based on "the romance of the Three Kingdoms", "the legend of jingzhongyue" or "twenty-four filial piety". The streets and alleys are like a sea of flags, dazzling and dizzying.

For example, in Taixing County, Jiangsu Province, colorful banners are also held in public places such as Chenghuang Temple and Confucius Temple. On the eve of the Double Ninth Festival, colorful banners drawn by famous artists are publicly displayed here. They are dazzling and beautiful. The crowds of visitors were surging, like watching lanterns on the Lantern Festival.

The Double Ninth Festival is an ancient festival for Chinese people. Although it is rare today to see such old customs as double ninth cake, wearing dogwood, and inserting colored flags, it is also a pleasure to climb mountains in the suburbs during this holiday, so as to keep fit and relax.