Striate shadows in the lungs can be good or bad and can be seen in certain lung diseases such as obstructive pneumonia and pulmonary fibrosis, as well as in physiologic changes such as in the elderly and after lung surgery. Lung streak shadow is seen as an old lesion under chest CT examination, and there are many reasons for its formation. Disease causes often include interstitial lung diseases such as obstructive pneumonia, pulmonary fibrosis, etc. If it is caused by inflammation of the lungs or pulmonary fibrosis and seriously affects the lung function, it should be promptly treated under the guidance of a doctor. For non-disease causes, such as aging of the lungs of the elderly will appear a little lung streaks, and previous lung surgery patients will also appear scar tissue repair, thus appearing streaks, both cases do not need to be treated, need to pay attention to maintain a healthy lifestyle. In both cases, no treatment is necessary and care should be taken to maintain a healthy lifestyle. The presence of streaks in the lungs should be evaluated by a physician for further treatment or care.