The authors have experienced three cases of pulmonary edema during anesthesia and after operation: 3 cases in urgent condition with toxemia and ectopic gestation underwent general anesthesia. One patient had no specific past history and the other two had cardiac or pulmonary problems before operation. In these cases, we believe that relative overloading of fluids in an undetected valular heart disease, preexisting pulmonary disease, severs preeclamptic condition, and myocardial depressant were the causative factors. High Fio2, with IPPB, diuretics, digitalis, dopamine and albumine were given immediately and so full recovery was observed in 4 hours to 3 days. There are many causes, prevention, and treatment for acute pulmonary edema. But believe that preoperative evaluation, intraoperative monitoring, prompt recognition and attention by the anesthetists are the most important preventive and therapeutic measures.