Obsolete February pulmonary tuberculosis does not affect life expectancy, as it does in healthy individuals. Obsolete tuberculosis is a history of previous tuberculosis, or occult Mycobacterium tuberculosis infection, with imaging manifestations left in the lungs after cure. Patients with no clinical symptoms of tuberculosis, but only calcified lesions, corrugated lesions, sclerotic lesions, purging cavities, pleural thickening and adhesions, or with calcification, are inactive and not infectious. Laboratory tests are negative for antacid bacilli on sputum smear, negative for Mycobacterium sputum culture, positive for PPD test, and normal blood sedimentation. Patients do not need anti-tuberculosis treatment, but need to increase nutrition, pay attention to rest, and actively treat primary diseases, such as diabetes and AIDS, to avoid the recurrence of tuberculosis infection in old tuberculosis lesions due to the decline of systemic or local resistance.