A positive t-cell for tuberculosis infection indicates a previous infection with Mycobacterium tuberculosis or the current presence of Mycobacterium tuberculosis in the body. Imaging tests, sputum culture tests and pathologic biopsies are needed at a later stage. 1. Imaging examination: such as chest X-ray examination and chest CT examination, which can observe whether there are lesions according to the morphology and density of the lungs, and is mainly used to differentiate between primary tuberculosis and secondary tuberculosis, etc., and can also exclude other chest diseases. 2. Sputum culture test: It is mainly used to draw sputum for laboratory tests to find out whether there are tubercle bacilli in the sputum, and it can also be identified with other pathogenic bacteria, including mycoplasma, chlamydia, bacteria and viruses. 3. Pathological biopsy: In the case of severe tuberculosis with high suspicion of cancerous tendency, pathological biopsy is needed to exclude malignant lesions in time. Bronchial fiberoptic endoscopy and open chest biopsy can be used for screening. If the current detection of tuberculosis infection T-cell positive, through the above several tests can accurately identify pneumonia, tuberculosis and lung cancer, confirmed diagnosis and then targeted treatment, so as not to delay the condition.