Objective To explore the clinical efficacy of Indigo thrombus aspiration system in acute pulmonary embolism(APE).Methods Seventy APE patients were selected.All patients were treated with percutaneous mechanical thrombectomy(PMT),and the Indigo thrombus aspiration system was used during surgery.The clinical efficacy and the occurrence of complications after surgery were compared in patients.Results The total therapy effective rate after surgery for patients was 94.29％(66/70),of which 42 cases were significantly effective,24 cases were effective and 4 cases were ineffective.The occurrence rate of complications after surgery for patients was 8.57％(6/70),including bradycardia in 1 case,tachycardia in 1 case,arrhythmia in 1 case,hemorrhage in 2 cases and renal insufficiency in 1 case.Conclusion The clinical efficacy of Indigo thrombus aspiration system in APE is significant and has certain safety.