Objective To discuss the impact of 3D-CRT on the pulmonary function of patients of NSCLC.Method To select 80 NSCLC patients having received treatment at the Suining Central Hospital from June2011 to December 2013

adopt 3D-CRT on them

and discuss the impact of 3D-CRT on the pulmonary function of NSCLC patients through analysis of the data of indexes of the grades of acute radiation induced pneumonia

pulmonary function

and DVH parameters.Results All 80 patients completed their treatment smoothly

and29 of them showed different degrees of radiation induced pneumonia.Changes of varying degrees occurred before and after the radiotherapy in the numbers of FVC

FEV1 and DLCO.Conclusion Treating NSCLC with3D-CRT produces certain impact on the pulmonary function of the patients.It is thus advised to monitor and comprehensively analyze the changes in patients’pulmonary function before and after the radiotherapy

DVH parameters

and the grades of radiation induced pneumonia so as to reduce negative impacts of the radiotherapy on the pulmonary function of NSCLC patients.