Abstract: Objective To explore a methodology of the Disability_ Adjusted Life Year( D A L Y) with smear_positivepulmonary tuberculosis and itsinfectivity . Method An assumed cohort of 2.000 cases was set up based on the age_specificincidence of 794 newly registered smear positive casesin Beijing in 1994 . Prognostic trees and model diagrams ofinfectivitywith natural history and D O T Sinterventions were constructed according to the epidemiology evidence . Results The re sultsshow that it would be neglect 29 .6 % of D A L Y S without consideration of the D A L Y caused by its infectivity . Conclusion D O T Sstrategy could not only reduce 92.9 % of D A L Y Srelated to T B patient itself but also 99.9 % of D A L Y Scaused by itsinfectivity.

Key words: Tuberculosis, pulm onary, DALY