Different treatment methods can have different effects on the function of immune system in lung cancer patients. Chemotherapy, while killing tumor cells, inevitably damages or reduces the immune function of the body; while treatment with chemotherapy combined with Yilong Qing Hua granules can effectively mobilize the immune response in the patient’s body to polarize in the direction of Thl, thus mobilizing cellular immunity more quickly to destroy tumor cells and also improve the patient’s quality of life. The experts divided 4O patients with non-small cell lung cancer into two groups, using chemotherapy alone and the combination of lung-clearing pellets, respectively. By observing the effect of Yilong Qing Hua granules on immune indexes such as DC subpopulation and T cell subpopulation, and exploring its mechanism of action. Yi lung Qing Hua granule is a special medicine for lung cancer developed by combining Chinese and Western medicine to treat tumors with the basic model of supporting and cultivating the root, detoxifying and anti-cancer, activating blood circulation and removing blood stasis, and combining with the results of modern medical drug screening. This formula has the functions of benefiting Qi and nourishing Yin, clearing heat and detoxification, activating blood circulation and removing blood stasis, supporting Zheng and fighting cancer, and treating both the symptoms and the root cause. Modern pharmacological studies have shown that Yi-Qi drugs can significantly enhance and regulate immune function, and have a bidirectional regulatory effect on T cells, reducing the activity of suppressive T cells and enhancing the activity of helper T cells. Dendritic cells (DCs) are specialized antigen-presenting cells, and based on the origin and function of DCs, human peripheral blood DCs are divided into two subpopulations. Among them, Thl cells mainly mediate the cellular immunity of the body, and cellular immunity is the main form of the body’s anti-tumor immune response. For the organism to be in a good anti-tumor state, the Thl-type response should be dominant; the dominant state of the Th2-type response will interfere with the anti-tumor immunity of the organism. If the Th2 response of the host organism can be reversed to the Thl response, it may provide another new means of tumor treatment. In the study, experts found that the level of DC-presenting antigen in lung cancer patients was lower than that of normal people, suggesting that the immune function of the organism in lung cancer patients was impaired. After combined Chinese and Western medicine treatment, the DC-presenting antigen level of lung cancer patients increased significantly, indicating that Yilong Qing Hua Granule can promote the increase of DC-presenting antigen level, which can effectively kill lung cancer cells in the body through cellular immune pathway. Lung cancer patients have low immune function, and multiple courses of chemotherapy can damage the immune function of the body. The combination of chemotherapy with Yilong Qing Hua granules can enhance the immune function of the body, reduce the toxic side effects of chemotherapy and enhance the anti-tumor effect of the body, and Yilong Qing Hua granules can reduce the toxic side effects of chemotherapy and improve the survival quality of patients, which have been confirmed time and again in the research. The combination of chemotherapy with Yilong Qing Hua granules can effectively mobilize the immune response in the patient’s body to polarize in the direction of Thl, so as to mobilize cellular immunity to destroy tumor cells faster. Experts analyze the scientific basis of Yilong Qing Hua granules to destroy tumor cells from the perspective of western medicine immunity, which further confirms the scientificity and vast prospect of using Chinese medicine to treat lung cancer.