Objective To discuss the reasons of death in the in-patients with percutaneous coronary intervention(PCI).Methods Retrospective analysis was done in 33 cases who died in or after the procedures among 3 252 in-patients with PCI.Results 4 patients died in procedures and the others died after procedures.The major reasons of death in order were:cardiogenic shock,ventricular fibrillation,acute left heart failure,multiple organ failure,heart rupture and acute renal failure.The in-hospital mortality rate was 1.01%.Conclusion The major reasons of death of patients with PCI are cardiogenic shock,ventricular fibrillation and acute left heart failure.Taking some measures will reduce the in-hospital mortality rate.