There were many books on ancient Feng Shui, among which the more famous ones included the Book of Changes, the Tao Te Ching, the Basic Theory of Feng Shui, the House Classic, the Introduction to Feng Shui, the Twelve Earthly Branches Feng Shui, the Xuankong Feng Shui, and so on. These books mainly introduced the theory and practice of ancient Fengshui, which was very helpful in understanding the ancient Fengshui culture.