In the 5th and 6th centuries, the greatest family in China pushed Tao Hongjing (456-536). The word Hong Jingliang, Huayang lived in seclusion at night. He was born in Liling, Danyang (now Nanjing, Jiangsu). According to the Biography of Southern History Tao Hongjing, Hongjing "had the ambition of keeping in good health when he was young, and got Ge Hong's Biography of Immortals". Read more than10,000 volumes ... especially the Yin-Yang and Five Elements, the calculation of wind angle, the geography of mountains and rivers, the product of maps and herbs. "