Abstract：Professor ZHENG Yuling believes that the weakness of healthy qi is the root of malignant tumor，and the direct strike of external pathogen is the key to the pathogenesis. In the clinical treatment of malignant tumor， Chinese medicine thinking should be taken as the basis and the protection of healthy qi in human body should be paid attention to，especially the innate kidney qi and acquired spleen and stomach qi. The treatment is centered on both elimination and reinforcement with multiple methods applied simultaneously.