Inclusion Criteria:  The patients with non-small cell lung cancer diagnosed by cytology or pathology meet the standards of clinical diagnosis and treatment guidelines for lung cancer of Chinese Medical Association (2018 Edition) TNM staging diagnosis of lung cancer meets the stage IA-IIIA  Exclusion Criteria:  Severe heart failure, acute progressive pulmonary inflammation, acute liver and kidney dysfunction in recent 2 weeks Incomplete clinical and follow-up data or disagreement or inability to conduct regular follow-up CT imaging evaluation A history of other malignant tumors and related tumor chemotherapy within half year, and previous history of radiotherapy Unable to walk, fail to complete the walking test, and the risk of fall down Unable to complete BIA examination due to pacemaker implantation and other reasons Withdraw from the study for any reasons