In ancient times, the application of the art of war emphasized weather, geography and human harmony, which was actually the astronomy, geography and numerology of Feng Shui. The word Feng Shui appeared in the Jin Dynasty after the Three Kingdoms, beginning with the book Funeral written by Guo Pu (AD 276-324). Zhuge Liang's eight-array diagram obviously evolved from the gossip in the Book of Changes. It is said that in ancient times, Fu looked up at the sky, looked down at the ground and approached all the bodies, thus inventing the Eight Diagrams. It can be said that Zhuge Liang's Eight Arrays benefited from gossip, which is a necessary deduction rule in the Book of Changes. Although there was no theory of geomantic omen in the Three Kingdoms period, Zhuge Liang should have used the embryonic form of geomantic omen. Compared with today, it is unlikely that today's master Feng Shui can surpass Zhuge Liang, but it is also impossible. In ancient times, war and chaos were mainly used in war. Today, Feng Shui in Hong Kong is mainly used for housing, personal destiny prediction and change, and even for architecture and interior design.