Abstract: Objective:To investigate the spiral CT and X-ray examination in the diagnosis of small peripheral lung cancer in the value,compare their results to clinical practice,the choice of appropriate inspection methods provide an important basis.Methods:From January 2008 to June 2011 in our hospital during the treatment and by CT and X-ray examination of 32 patients with small peripheral lung cancer clinical data,CT and X-ray examination of their results were compared.Results:CT examination of the tumor from lobulation,pleural indentation,vacuole sign,sign and burr vascular symptoms of cluster detection was significantly higher than the X-ray examination,the difference between the two methods was statistically significant significant(P<0.05).Conclusion:X-ray examination when a commonly used screening tool,but because of its resolution and tissue density influenced by other factors,could easily lead to misdiagnosis or missed diagnosis,diagnostic yield is less than spiral CT,CT of small peripheral lung cancer in check the application has a higher value.