The paper introduces Wang Qingqi’s thought and experience of treating gastric precancerous lesions.In WANG’s view point

disease prevention

improvement of cancer cell growing environment

collateral theory and the view of spleen controlling mucous membrane should be taken into consideration in treating gastric precancerous lesions. His clinical ideas are as follows: regulating five zang-organs to cure the spleen and improve the small ecological environment

regulating mechanism of the spleen and stomach to promote micro ecological environment

and eliminating stagnation and detoxicating cancer to treat local pathological changes.