Professor LIN Hongsheng，who has been engaged in the clinical and scientific research work of tumors with integrated traditional Chinese and Western medicine for more than 40 years，put forward the theory of “consolidating the foundation and clearing the source” for tumor prevention and treatment，and pays attention to the staged and standardized treatment of tumors.Professor LIN believes that patients with early lung cancer after surgery have deficiency of healthy qi and incomplete elimination of cancer toxicity.Thus the treatment should be based on the method of consolidating the foundation and clearing the source，with the main principles of replenishing qi，nourishing yin，removing toxin and resisting cancer，supplemented by the methods of nourishing blood，activating blood，and strengthening the spleen and kidney，according to the symptoms.In this way，the quality of life of patients can be improved and the recurrence and metastasis reduced.