A photoflurographic mass survey of P-a chest had been done to the13136 residents (male 6264, female 6872) in Jeonbug province , Korea for about 2 years from May 5, to Dec. 19, 1978 and from Mar. 5to Dec 22,1979. The results are as follows : 1. The prevalence rate of all active pulmonary tuberculosis is 5.3%. 2. The prevalence rate of male (8.8%) is 4.2% times higher than that of female (2.1%). 3. The prevalence rates of all old groups above fifty years are higher than that of remainder under fifty years of age. Of these, 61-70 years old age group is highest in prevalence rate. 4. According to extent of active pulmonary -tuberculosis, 77.5% is minimal, 15.4% is moderately advanced, and 7.1% is far advanced. Inactive pulmonary tuberculosis are 39 cases (0.3% to objective population). 5. In the incidence of the involved side, right side is about 2 minute higher than the left , and involvement of both sides is increased in moderately and far advanced pulmonary tuberculosis. In all pulmonary tuberculosis, one or both upper lung fields are most commonly involved. The incidences of cavity in moderately and far advanced pulmonary tuberculosis show no significant difference. 6. The incidence of other intrathoracic lesions are as follows : suspected hypertensive heart disease 2.4%. dextrocardia with situs inversus 0.04%, pleural calcification 0.4%, pleural thickening 0.2%, pleural effusion 0.1%, pneumonia 0.02%, bronchiectasis 0.15, lung abscess 0.02%, C.O.P.D. 0.2%, suspected lung tumor 0.06%, pneumothorax 0.0076% and suspected mediastinal tumor 0.02%.