The Double Ninth Festival began to be observed in the Warring States Period. In the Han Dynasty,it was called Zhuyu Festival,or Chrysanthemum Festival as there was a custom of drinking chrysanthemum wine,eating colored cakes,and hanging an herb called zhuyu (comus officinalis) on the door. The festival comes when the day is clear with sunny skies and crisp air—a favorable time for climbing mountains. So climbing is a popular activity to mark the day in many places. The custom of hanging zhuyu on the door and climbing mountains started in the Han Dynasty，which was endowed then with the significance of eliminating diseases and subjugating disasters. In the Tang Dynasty, the custom of climbing and appreciatingchrysanthemum became so widely spread as to be taken as the main activity on this occasion,and to these,there added other activities,such as going to the mountain fair,offering sacrifices at the ancestral graves,hunting outsides, worshipping the God of fortune, bounding girls' feet. Nowadays, the Double Ninth Festival day is fixed as the Elderly Day，on which activities are held to show respect and love to the elderly people.