Chronic atrophic gastritis(CAG) is a gastric precancerous disease，which has the characteristics of occult onset，lingering course，and prolonged deterioration.Professor Liu Fengbin，a famous doctor of traditional Chinese medicine in Guangdong Province，has been treating CAG for many years.He believes that the etiology and course characteristics of CAG are closely related to the pathogenic process of fuxie(latent pathogen).The treatment of CAG based on the theory of fuxie follows the principles of expelling pathogenic factors，tonifying the spleen and stomach，removing blood stasis，dredging collaterals，clearing heat，and nourishing yin.The curative effect is remarkable by using drugs according to the syndrome.