Abstract: Objective To investigate the TB infection situation in the middle and primary school in Huairou District of Beijing .MethodTuberculin (PPD) skin test had been done in students of middle and primary school. The characteristics of the infection were analyzed. ResultThe rates of PPD results5 mm of the students in the senior,junior middle school and the primary school was57.7%,44.4%, and 21.6% respectively .And the rate of PPD Results 15 mm was 16.8%,13.5%,and 2.8%. The difference of 5 mm and 15 mm between the different grades was significant. The rate of PPD Results 15 mm in the students who have TB contact was 45.2% , while the opposite was 10.6%, which was 34.6% less than the former. ConclusionTo put the students of the middle and primary school as the objects of preventive TB treatment is an essential measure to control TB .

Key words: Pulmonany tuberculosis / prevention and control, PPD