Xianqi Cave is located in Dongguanshang Village, Zhangfang Town, Fangshan District, Beijing. It is less than 100 kilometers away from the Third Ring Road of Beijing. It is the only karst cave in North China that can be entered by a 500-meter waterway. This cave was opened by an enthusiastic group in Guanshang Village in the spring of 1998. It immediately caused a sensation and was called "Shihua Palace", "Shenzhu Cave", "Cangqiong Cave" and "Yidongtian". Then a wandering monk from Mount Wutai who was looking for a place to practice came to the cave and exclaimed: "Good! Good! There are people above people, there are heavens beyond heavens, and there are caves in caves. Here, 'immortals live together', we are humble, Amitabha..." From then on, it was named "Xianqi Cave" and made public. The Dongguanshang area is composed of a number of isolated karst caves. Such a concentration, such a large scale, and so many landscapes are rare. It can be compared with the four major caves in my country: Fujian "Shihua Cave", Guilin "Ludi Cave", Hangzhou "Yaolin Cave", Beijing "Qianzhen Cave", and it is on par with them and is known to the world, but it is also unique. The strata of the cave body are dolomite limestone and sandy dolomite. It was formed in the early Sinian period 1.6 billion years ago. In other words, 1.6 billion years ago, this was a vast ocean, and thick carbonate materials were deposited on the seabed. Due to the uplift of the earth's crust, after several vicissitudes, about 100 million years ago, a mountain-building movement occurred in North China, and Beijing Xishan was formed. The stratigraphic faults that occurred simultaneously, under the combined effects of paleoclimate, paleogeography, and paleohydrogeological conditions, groundwater eroded the highly soluble carbonate strata along the fault zone, and then collapsed, flushed, and expanded. Over time, a series of groundwater channels with different diameters and lengths were formed, ranging from a few meters to a thousand meters. The crust rises again, and the cave is separated from the water surface, and then it enters a long stage of stone flower formation. Carbonate substances in the water precipitate, re-crystallize in the cave, and attach to the cave wall, cave ceiling, and cave bottom. This is stone flower. "Xianqi Cave" is one of them. The stone flowers in the cave began their formation and development process 1 million years ago, and they are still "growing", "modifying", and "perfecting" themselves to this day. According to the classification of cave sediments, there are five sedimentary types and dozens of forms, including stalactites, stone stalactites, stone curtains, stone pillars, stone towers, stone waterfalls, stone mirrors, stone lotus, stone Buddha's hand, crystal flowers, calcium plates, stone drums, etc. The above forms are numerous from microscopic to macroscopic. There are "farmers' courtyards", "Hangzhou miniatures", "Panlong jade pillars", "stone waterfalls flying down", "Taishang Pavilion", "Xianqi Hall", "The sky is about to fall", "God turtles follow longevity", "crocodiles guarding the cave", "Eight Immortals Crossing the Sea", "Monks Sitting in Meditation", "Giant Buddha's Hand", "Tropical Rainforest", "Canyon in the Cave", "Jade Lotus" and so on. In particular, "The Great River" is very similar to our mother river - the "Landscape of the Yellow River Basin". The "glaciers", "lakes", "waterfalls", "gorges" and "plateaus" at the source are all amazing.