Abstract:〔Abstract〕 Objective To analyze the effect of Jianfei Qingzhuo decoction on serum indexes of patients with lung cancer complicated with pleural effusion undergoing hyperthermic perfusion chemotherapy of thoracic circulation. Methods A total of 96 patients with lung cancer and pleural effusion were selected from January 2018 to December 2020 in Jinshui District General Hospital of Zhengzhou. 48 patients with chemotherapy alone were selected to be included in the chemotherapy group, and 48 patients treated with Jianfei Qingzhuo decoction on the basis of chemotherapy were selected to be included in the combination group. The clinical effects of the two groups were evaluated, and the changes of clinical indexes of the two groups were observed before and after chemotherapy. Results The total control rate in the combination group was higher than that in the chemotherapy group, and the difference was statistically significant (P < 0.05). After chemotherapy, the levels of serum C-reactive protein (CRP), carbohydrate antigen (CA) 199 and carcinoembryonic antigen (CEA) in the combination group were lower than those in the chemotherapy group, and the differences were statistically significant (P < 0.05). After chemotherapy, the levels of CD3+ , CD4+ and CD8+ in the combination group were significantly higher than those in the chemotherapy group (P < 0.05). The incidence of chemotherapy adverse reactions in the combination group was 6.25 %, which was lower than 20.83 % in the chemotherapy group, and the difference was statistically significant (P < 0.05). Conclusion Jianfei Qingzhuo decoction can help improve the clinical effect and serum index of patients with lung cancer and pleural effusion undergoing hyperthermic perfusion chemotherapy of thoracic circulation.