Yang's "Helping the Poor" is also known as "Yi" and "Helping the Poor". In 854 AD, Yang Gong entered the Imperial Academy and was appointed as Dr. Jin Guanglu, who was in charge of palace architecture, royal cemetery, astronomical observation, royal sacrifice and other affairs. In 875 AD, due to the Huang Chao Uprising, Yang Gong fled Chang 'an with his palace geomantic cheats. After living in seclusion in Ganzhou, Jiangxi Province, he taught geomantic omen. Later generations called his geomantic theory "Yang Gongfeng Water". The core idea of Yang Gong's geomantic omen is the harmony between house, grave and natural environment, emphasizing the choice of natural landscape to avoid misfortune. Yang Gong geomantic omen mainly spread in Ganzhou, Jiangxi, and then gradually spread to all parts of the country and Southeast Asia.