On this day, 31 years ago, on April 10, 1994 (February 30, 1994 in the lunar calendar), scientists discovered that the Himalayas were similar to castles in the air. On April 10, 1994, scientists discovered that the Himalayas, the highest mountain range on earth, are similar to castles in the air and do not have the huge roots that ordinary mountain ranges should have. This has become an unsolved mystery in the research of the Qinghai-Tibet Plateau Mountains. According to field inspections by scientists participating in the National Eighth Five-Year Plan Climbing Plan "Research on the Formation, Evolution, Environmental Change and Ecosystem of the Qinghai-Tibet Plateau" project, several huge mountains on the Qinghai-Tibet Plateau, the highest land on the earth, with an average altitude of 4500 meters, have almost the same characteristics of lacking mountain roots. Li Shijie, associate researcher at the Lanzhou Institute of Glaciology and Frozen Soil, China Academy of Sciences, said that "mountain roots" refer to the structural part of the mantle that penetrates the earth's crust and penetrates into the earth's molten rock due to gravity. According to the general principle of mechanics, the larger the mountain, the heavier the volume, and the deeper the root of the mountain, so as to maintain the balance of forces. Several huge mountain ranges on the Qinghai-Tibet Plateau are world-class mountains. There are 14 peaks above 8000 meters in the world, 9 of which are on the Qinghai-Tibet Plateau. In particular, Mount Everest, known as the world's most, is 8848 meters above sea level. The weight of its mountain body can be imagined. In addition, the Qinghai-Tibet Plateau is a young continent with a thin crust. According to common sense, these huge mountains have full weight to penetrate the mantle and bury huge mountain roots. What is puzzling is that these giants are completely unresponsive to "common sense" and stand tall. According to scientists, the large mountains on the Qinghai-Tibet Plateau have no mountain roots, which may be related to the land-making movement formed by the plateau. During the Pan-African event in the geological and structural history that occurred 500 - 400 million years ago, the Qinghai-Tibet Plateau was merged from the Lhasa land mass and its adjacent areas to become part of the ancient Gondwana continent. After 100 million years of relatively stable development, during the 400 million-year Devonian, this supercontinent began to rotate clockwise and continued until the middle of the Permian, triggering changes in the global land-sea pattern. After that, at the turn of the Pliocene and Quaternary, the Qinghai-Tibet Plateau began to rise significantly and strongly, and it has not stopped yet. Therefore, mountain roots cannot be formed yet. In addition, the movement form of the Qinghai-Tibet Plateau plate may also have an impact. This plateau was formed by the Indian plate subducting northward and obliquely inserted under the Eurasian plate, while the Tarim plate subducting southward to under the Kunlun Mountains. The uplift caused by this form of plate movement may affect the formation of mountain roots. Despite this, the Himalayas, Gangdise, Kunlun and other mountain systems on the Qinghai-Tibet Plateau still stand high into the clouds. How do they maintain balance? To solve this mystery, further investigation and research are needed. This high-tech climbing plan jointly carried out by scientific research departments such as China Academy of Sciences, Lanzhou University, Lanzhou Institute of Seismology of the State Seismological Administration, and various colleges and universities will gradually understand the reason.