Negative pulmonary tuberculosis refers to the tuberculosis bacillus examination, no positive tuberculosis bacillus was detected, there are two possibilities in this case: one is that the patient belongs to the bacillus-negative pulmonary tuberculosis before the early treatment, that is to say, the excretion of the bacillus and virulence are weak, and there is no antacid bacillus detected in sputum, and this kind of bacillus-negative antacid bacillus belongs to antacid bacillus, and it is also called negative pulmonary tuberculosis. The treatment course is around six months. Lung imaging is sufficient if it shows only type 3 TB without cavitation or pleural effusion. Another kind of if tuberculosis negative appeared in the treatment later, repeated reexamination of antacid bacilli are not found positive antacid bacilli, indicating that tuberculosis bacilli turn negative, indicating that the treatment effect is better, adhere to the original program of treatment, the treatment course is also in half a year or even more. Because more than half a year of anti-tuberculosis treatment, mainly for cavitary tuberculosis, tuberculous pleurisy and drug-resistant tuberculosis, the shortest treatment program is the six-month supervised treatment program, which can make the conventional tuberculosis from positive to negative, and imaging can suggest that the lesions are obviously absorbed and dissipated, and the clinical manifestations disappear.