Abstract: Data concerning pulmonary embolism from 382 autopsies were reported in this paper. The data concered 194 males and 188 females. The age at death was from 14 years to 94 years and the average age of death was 62.4 years. The primary underlying disease processes were as follows: Malignant tumor 39.8% Pulmonary artery 14.1% arteriosclerosis Deep vein thrombosis 11.5% Myocardial infaction 11.0% Chronic pulmonary 9.9% heart disease Most of the pulmonary emboli (54 1%) were associated with heart, lung and blood vessel diseases and the most frequ- ent cause of the pulmonary embolus was thromboembolism. of the 382 cases, 237 cases (62.1%) had pulmonary infarction. The antemortem diagnosis of pulmonary embolism was made in 114 cases (29.8%). 32 cases (8.4%) had sudden death as a result of their pulmonary embolus. In the present paper the incidence, pathogenesis, pathologic changes and clinical manife- stations of pulmonary embolism were discussed.