This decision tree is normally applicable in data mining in order to produce a framework that predicts the value of object or its dependent variable, established on the various input or independent variable. CART algorithms are mainly used in Medical, Statistics etc. For heart disease patients it is complex for medical practitioners to predict the heart attack as it is a complex task that requires experience and knowledge. First part of paper has introduced the CART algorithm with associative applications and its classification method. Other part has represented a real world dataset of male patient taken for further analysis.