This paper is to expound the theoretical basis and the mechanism of action of lung cancer from the perspective of Chinese medicine and modern medical theory，combined with the experience of some modern scholars in the treatment of lung cancer from the liver，as well as to summarize the clinical efficacy.The advantages of treating lung cancer from the liver were analyzed.Chinese medical theory supports the principle of treating lung cancer from the liver.It is considered that liver and lung are related in physiology and pathology，and can be divided into liver constraint and qi stagnation syndrome，qi stagnation and blood stasis syndrome，the liver fire invading the lung syndrome，the liver and lung yin deficiency syndrome.The clinical study also supports this view.The treatment from the liver is an important principle in treating lung cancer.It can obviously improve the symptoms of body，mind and respiratory system of patients，enhance the immune function，strengthen the healthy qi，and improve the quality of life，and finally achieve the purpose of anticancer by reinforcing the healthy qi and dispelling the pathogen.The mechanism is related to inducing apoptosis and inhibiting the proliferation of tumor cells.