To investigate the relationship between the distribution of traditional Chinese medicine (TCM) syndrome factors and clinical factors in lung cancer, and the influence of Feiyanning Decoction originated from Jingqi theory on TCM factors.Methods:A total of 118 patients were recruited from Weifang Hospital of Traditional Chinese Medicine from November 2016 to November 2017.The clinical pathological investigation method was used to classify and analyze the five elements of yin deficiency, yang deficiency, qi deficiency, blood deficiency and no deficiency in 118 cases.The relationship between each factor and age, sex, course of disease, ECOG score, treatment method, pathological type and location of tumors was analyzed by single factor analysis of variance, rank sum test and chi square test respectively.The effects of Feiyanning Decoction on the TCM elements was analyzed.Results:The main factors of TCM in lung cancer were yin deficiency and qi deficiency, accounting for 94.07% of the total factors; yang deficiency factor was related to radiotherapy and operation (P<0.05); blood deficiency factor was related to the course of disease, ECOG score, and operation (P<0.05); qi deficiency factor was related to the ECOG score (P<0.05); Feiyanning Decoction significantly improved yin deficiency and qi deficiency (P<0.05).Conclusion:Yin deficiency factor and qi deficiency factor play a leading role in the distribution of TCM elements in lung cancer.Feiyanning Decoction has significant curative effects on improving the symptoms and quality of life of patients with deficiency of essence and qi, which is worthy of clinical promotion.