It is to introduce professor LIU Qiquan's experience on treating chronic atrophic gastritis from lung. Professor LIU Qiquan has a profound theoretical foundation in traditional Chinese medicine. He has more than 40 years of clinical experience and has rich experience on the diagnosis and treatment of spleen and stomach diseases which has unique curative effects, especially in the treatment of chronic atrophic gastritis. The author is fortunate to learn from Master LIU and sums up his experience on treating chronic atrophic gastritis. Chronic atrophic gastritis is a digestive system disease characterized by focal or extensive atrophy of the epithelium and proper glands of the gastric mucosa, thinning of the mucosa and thickening of the muscularis mucosa. It is a common clinical disease. Its incidence is positively correlated with age. The main clinical manifestations of chronic atrophic gastritis are lumps, fullness, distension and pain, which are mostly attributed to the categories of diseases such as "stomach fullness" , "bloating" and "noisy" . The pathogenesis is nothing more than Qi (lung-Qi inversion) , heat (lung-heat accumulating in stomach) and blood stasis (blood stasis in lung-stomach blood stasis) , deficiency (lung and stomach Yin deficiency) . Chronic atrophic gastritis is located in the stomach and related to lung. Professor LIU Qiquan clinically uses the methods of dispersing lung and descending stomach Qi, clearing lung and descending stomach Qi, regulating lung and descending stomach Qi, nourishing lung and harmonize stomach to treat chronic atrophic gastritis and the treatment has achieved good effect.