Abstract: This paper reported the clinial x-ray result of 29 bronchiogenic carcinoma patients aged under 30. Emphasis is discussed the study of age division of lung cancer in young adults, the characteristic of clinical x-fay finding and the cause of misdiagnosis The authors suggest that we can not only use schwart's method to calculate the tumor doublling time for evalution the histologic patterns of lung carcinnoma in young adults.