Abstract：This paper introduces the clinical experience of LI Aocai，a renowned Chinese medicine practitioner， in diagnosing and treating precancerous lesions of gastric cancer. LI Aocai believes that the primary pathological basis for the onset of precancerous lesions of gastric cancer is the dietary irregularity and the depression transforming into heat； heat，toxin，and deficiency are the characteristics of its pathogenesis，and spleen deficiency and healthy qi depletion persist through the entire development of the disease. Therefore， in the treatment， emphasis is placed on reinforcing healthy qi and strengthening the spleen，with eliminating phlegm，resolving blood stasis，and detoxifying as the key measures，and unblocking the qi movement and discharging fire from the shaoyang as the supplementing therapy. Based on these，a Jianpi Jiedu Xiehuo Prescription with the effects of nourishing qi and strengthening the spleen，eliminating phlegm and resolving blood stasis，and clearing heat and detoxifying is created. In clinical practice，modern Chinese medicine pharmacology research results are combined，and anti-tumor medicines are appropriately added.