1. There are different opinions about the origin of the custom of climbing: one is that it may originate from the worship of mountain gods in ancient times, believing that mountain gods can protect people from disasters. Therefore, during the Double Ninth Festival, when "the anode must change", people go to the mountains to play in order to avoid disasters. Perhaps at first it was necessary to worship mountain gods for good luck, but later it gradually evolved into a recreational activity.

3. Another saying is that during the Double Ninth Festival, the autumn harvest has been completed and farming is relatively free. At this time, the wild fruits and medicinal materials in the mountains are in the mature season. Farmers have gone to the mountains to collect wild fruits, medicinal materials and plant raw materials for sideline industry. This kind of collecting in the mountains is called "small autumn harvest" by farmers. The custom of climbing may have originally evolved from this.

3. As for the day of Double Ninth Festival, it will happen later. That means to use it as a symbol and starting point to promote, just like spring is the time for tree planting, and people designate Arbor Day. In addition, during the Double Ninth Festival, the weather is sunny and the temperature is cool, which is suitable for climbing high and looking far.