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.

重阳节，农历九月初九，二九相重，称为“重九”，民间在该日有登高的风俗，所以重阳节又称“登高节”。还有重九节、茱萸、菊花节等说法。由于九月初九“九九”谐音是“久久”，有长久之意，所以常在此日祭祖与推行敬老活动。重阳节与除、清、盂三节也是中国传统节日里祭祖的四大节日。2012年12月28日，法律明确每年农历九月初九为老年节。