According to relevant records, the contents of the ancient book Lian Shan Yi can be roughly summarized into three aspects: First, with various animals as symbols and pictures and schematic symbols as the main forms of expression, the sun, moon, stars, twenty-eight nights and other astronomical phenomena and their calendar settings are recorded.
Secondly, on the basis of astronomical calendar, the rules and principles of Yin-Yang, heavenly stems and earthly branches conflict, mutual punishment and mutual agreement are deduced.
The third is to predict and guide various activities according to these principles, including travel, business, production, hunting, marriage and so on. Generally speaking, Lianshan Yi is an encyclopedia of ancient Shennong, focusing on astronomical calendar and farming.
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The content of Lian Shan Yi has infiltrated into ancient medical literature, but it may also escape into the miscellaneous studies of Feng Shui. People use it to view mountains and water, choose houses and graves, and gradually evolve some theories about mountains, caves, wind and water, and dragons.
Gui Zang Yi is a businessman's summary of Yi, and its Zhongtian Bagua Map symbolizes the collection place of Kun (land). It has a great influence on Chinese medicine, such as Huangdi Neijing.
Ma Guohan's Collection of Books on the Jade Letter Mountain House and On the Schools Attached to the Lianshan Mountain quoted Hu Yinglin as saying: There are ten volumes of Lianshan Yi, as shown in the Tang Dynasty's Records of Arts and Culture. According to the first chapter of the Six Classics and the Book of Changes, the change of Xia and Shang Dynasties is absolutely different. Sui Niuhong (Hong) bought 370,000 copies of Suicide Notes, Wei Wencheng and others compiled History of Sui Dynasty, and Jin, Liang and others all published articles about death and escape. None of them had heard of the so-called Lianshan, which was only published in the Tang Dynasty.