Development and improvement of mechanical cardiac support systems, for example, IABP, and PCPS, is so remarkable that recently, we can rescue severe heart failure, cardiogenic shock, and acute fulminant myocarditis with these mechanical support. Moreover, indications of these mechanical support systems are widened to the support of high risk coronary interventions such case as acute myocardial infarction with poor LV function. Mechanical cardiac support systems are very important for the treatment of high risk patients. In these mechanical support systems, percutaneous systems such as IABP and PCPS are widely used. So in this article, we review mainly indications, management, and complications of IABP and PCPS with acknowledgement of our hospital.