These radiologic studies were carried out on 265 cases of silicosis which were diagnosed clinically at industrial Accident Hospital affiliated with Catholic Medical Collage, during the period of 3 years from 1974 to 1976. 265 cases of silicosis of 96 cases (35%) of coal miner, 91 cases (34%) of coal choicer and 82 cases (31%) of others. The average age was 42.2 years and average working period was 9.2 years. Qualitative features in the analysis of roentgen findings were based on UICC/Cincinnati and KLO classification. The qualitative features showed 26% of "p" opacity, 46% of "q" opacity, 4% of "r" opacity as rounded profusion and 5% of "s" opacity, 11% of "t" opacity, 2% of "u" opacity as irregular profusion of small opacities. Large opacities showed 3% of group A, 2% of group B and 1% of group C. Quantitative features revealed 25% of Type 1, 54% of Type 2, 16% of Type 3 and 5% of Type 4. The qualitative and quantitative features showed significant differences as age and working period increased. 70% of this study group were associated with radiological complications and complication rate was increased with age and working period. Major complications were pulmonary emphysema, tuberculosis and pleural abnormalities.pulmonary emphysema, tuberculosis and pleural abnormalities.