Abstract: Objective To analyze the clinical characteristics of connective tissue disease complicated with pulmonarytuberculosis. Method To retrospectively analyze 33 cases of connective tissue diseases complicated with infectious pulmonarytuberculosis treated during 1984 ～1998 . Results 1 .71.4 % ofthe patients had along term treatment with im munodepressiondrugs before onset of pulmonary tuberculosis in 33 cases.2 . The disease were extensive in chest X ray examination ,81.8 %with pulmonary cavities,66.7 % with pulmonary interstitialchanges,69.7 % with pleuralthickening .3 . Pulmonary tuberculosiswere easily misdiagnosed and leakdiagnosed ,prognosis were worse . Conclusion We might look out for occurrence of pul monary T Bin patients with connective tissue disease for early diagnosis ?treatment and favourable prognosis.

Key words: Connective tissue disease, Tuberculosis, pulm onary