This practice comes from the Japanese practice path, which is called Shuifenli, and its origin may be earlier. It seems to be an ascetic method for mountain believers under the early Shinto thought in Japan. On the one hand, meditation under waterfalls can get extreme experience, on the other hand, it also meets the religious ritual requirements of "purification" and washing away sins. The practice path is the product of the combination of mountain belief and Tantric Buddhism, but the ritual of Shuifenli has been kept in the process of its religious practice. Later, it was also spread to Buddhism or Shinto, but unlike the practice of practicing Daoism (or mountain falling) under waterfalls, after the improvement of Buddhism, pure water was basically used to wash the heads of practitioners, which was much gentler. The following is a passage from Hideki Nishioka entitled "The Story of Cold Travel and Cold Remembering Buddhism" in the Japanese Buddhist magazine "Nanying Buddhism" in 1938, which can be used as evidence: "It turns out that the monks belonging to this temple will be naked in linen every winter and cold month, with a white kapok headscarf wrapped around their heads, begging for alms from door to door, and then bathing their bodies with water to pray and chant scriptures. This activity, called "Cold Dirt Separation", is a test and ceremony for novice monks and Buddhists to get started in the Tibetan Academy of Mount Anma. The so-called "dirty separation" literally means to purify the body with water and pray to the gods and buddhas. It is said that this habit existed long before Buddhism came, that is, people used to bathe their bodies with water when they wished, so later, not only Buddhism, but also Shinto had the so-called swaddling, and the practices were similar, except that Buddhism turned him into a dirty separation. The purpose of washing the body and mind with swaddling clothes and discarding dirt from dirt seems similar, but the meaning is somewhat different. Because the concept of "dirty separation" has the unique ascetic thought of India, in Japan, especially Shinrikyo practitioners like to practice asceticism in famine, so they call it "taking dirty separation", and later further turn this practice into the practice of monks traveling alone in the mountains and practicing on foot, that is, the so-called "mountain crouching" and "practitioners". Therefore, since ancient times, there have been many stories in Japan about the wilderness of Yamagata and the repairman, which led many people to misunderstand that the activity of dirt separation is the patent of Yamagata and the repairman. In the practice of ordinary mountaineers and inspectors, they usually make a seat under the waterfall in the mountain and let the water wash away the whole body, so as to remove the dirt on their bodies, which is called "peak entry."