The double ninth festival, the ninth day of the ninth lunar month, is known as the "double ninth", which is also known as the "double ninth", which is also known as the "climbing festival". There are also nine, dogwood, chrysanthemum festival and so on. Since September 9th "jiujiu" homophone is "long", there is permanent meaning, so often on this day ancestor worship and implementation of the old activities. The double ninth festival is also the fourth festival of Chinese traditional festivals. On December 28, 2012, the law is clear on the ninth day of the ninth lunar month.