Professor BAI Zhengping believes that the key causes of lung cancer in the elderly are deficiency of righteousness and imbalance of viscera; stagnation of Qi and blood and obstruction of collateral are the main factors; endogenous cancer toxins and entrenching of evil toxins are the fundamental causes; phlegm and heat toxins Turbidity and the mutual attack of various evils are its main symptoms; it has three characteristics: hidden onset, rapid transfor-mation and complex pathogenesis. Professor BAI Zhengping uses the strategy of "hybrid treatment, micro-targeting, and situation assessment" to treat lung cancer in the elderly, and has achieved good clinical results. Also cite one clas-sic case to provide evidence.