The country is too small and has a small population; In the event of a disaster, a few people will die less and a few people will die less. In ancient times, medical conditions were poor, and diseases and plagues were possible.

When the British explorer found these carved boards in Niya County, Xinjiang, he immediately recognized that the words carved on the boards were a long-lost death from overwork. It is believed that the Niya River basin suddenly stopped flowing due to the change of environment, which led to the sudden shortage of people's living resources and the change of climate. It became dry and hot here, so they had to leave the country to survive. However, this can't explain why they didn't take valuables and official documents with them when they left, and some doors were unlocked, as if they had gone out for a while and would come back soon.

There are also views that it disappeared because of the war. According to the explanation in the Kalash Sutra, there was an extremely powerful tribe in the south of the pure sleep country at that time, which posed a great threat to the pure sleep country. On the day of the disaster, this powerful tribe attacked Jingjue County, killing the unsuspecting residents in the city and giving Jingjue the most fatal blow. But there is no record of the mysterious tribe "Soapy" in the reference materials, which makes many people suspect that this "Soapy" may be another unknown mysterious civilization.

Another view is that they are ecological disasters caused by over-exploitation of human beings and environmental and ecological changes. With the sudden change of history and the change of the times, many people moved to rich or good places to live. The population of the ancient city became less and less, leaving the old, the weak and the sick, the living environment became worse and worse, wild animals ran rampant, and finally it was covered by the desert. No matter how brilliant a country is, there are times when it declines. This is the answer left by history.

The desert is ruthless, but the madness of the desert is caused by human beings. History is a mystery, and a perfect country is like a meteor in the long river of history. What is the truth of the perfect country that has passed away in a blink of an eye and what kind of answer will it give us? Perhaps there will never be an answer.