Pulmonary embolism is an emergency condition with high morbidity and mortality, and many methods can help to diagnosis pulmonary embolism. Echocardiography is of great value in the determination of clinical types of PE and evaluation of hemodynamics of PE and therapeutic effect. Transthoracic echocardiography and transesophageal echocardiography are commonly used clinically, and both possess relatively higher sensitivity and specificity. Echocardiography outperforms the other imaging examinations in the diagnosis of acute pulmonary embolism. The roles of echocardiography in the diagnosis of pulmonary embolism are reviewed in this article.