Double ninth festival (also known as double ninth festival) is a traditional festival of the han nationality on the 9th day of the 9th month of the 9th lunar month. In ancient times, people in the double ninth festival have high blessing, autumn tour chrysanthemum, wearing dogwood, worship god worship ancestors and feasting for life and other customs. In addition, because the ninth day of the ninth lunar month sounds like “jiu jiu”, which means “long time”, ancestor worship and filial piety activities are often carried out on this day. The two important themes of double ninth festival activities are to appreciate the autumn and to show gratitude and respect for the elderly. Double ninth festival and New Year’s eve, tomb-sweeping day, July half as China’s four traditional ancestor worship festivals.