The first reason is that the royal family of the Qing Dynasty regarded Changbai Mountain as the Long Mai of the Qing Dynasty. In order to avoid damaging Feng Shui, ordinary people are not allowed to enter. In the Qing Dynasty, the rulers regarded Northeast China as the land of Longxing, and Changbai Mountain was the center of this land of Longxing, so they thought Changbai Mountain was Long Mai. They think that when Changbai Mountain is destroyed, the fortune will be destroyed, and the rule of the Qing Dynasty in Shanhaiguan will also go to extinction. Therefore, for more than 200 years, except for the royal family of the Qing Dynasty, other ordinary people were forbidden to enter Changbai Mountain.
The second reason is that the Qing royal family took Changbai Mountain as its base, which was a back road for themselves. Because the terrain of Changbai Mountain is responsible, most of the mountains are virgin forests, and only Manchu people know the terrain better. If their rule is overthrown, Changbai Mountain will be their last retreat. In addition, Changbai Mountain is adjacent to Mongolia, and sending troops to Changbai Mountain is also to strengthen border defense, prevent foreign enemies from invading, and show foreign forces the military strength of the Qing Dynasty.
The last reason is that the Qing rulers want to monopolize the huge resources of Changbai Mountain. Changbai Mountain is rich in products, rich in all kinds of rare treasures, and there are countless rare resources such as ginseng, velvet antler and pearls. The ginseng farm in Changbai Mountain gives the first-class ginseng to the royal family of Qing Dynasty every year, and officials in Changbai Mountain area catch ten deer and give them to the Ministry of Interior every year. The pearls in the hands of officials are all shipped from Changbai Mountain, so it can be said that some precious resources in Changbai Mountain have become exclusive supplies for the Qing royal family.