The most important works on Buddhism by Tsongkapa can not be separated from Buddhism, scriptures and expound of predecessor. When studying the Buddhism idea of Tsongkapa, one must separate his idea from the others’ in order to locate the Buddhism system of Tsongkapa. This article stands by the angle of hermeneutics and tries to find the reconstruction which exists in the hermeneutics. Only when these have been done, one can isolate the idea of Tsongkapa’s own from the others’, especially Candrakrit’s. It enables us to grasp the Tsongkapa’s Buddhism idea exactly in an all-round way.