The pulmonary thromboembolism (PTE) developes occasionally in trauma, surgery and pregnancy. It presents dyspnea, tachycardia, syncope, hypotension and may be fatal by right heart failure. Severe intraoperative PTE is rare. But an intraoperative PTE occurs, it is difficult to diagnose with classic diagnostic measures such as ventilation-perfusion scan, pulmonary angiography, so appropriate management may be delayed. We experienced a case of severe PTE during Ceaserian section of placenta previa totalis. The patient survived and showed complete resolution after 1-year follw-up.