At present, the academia and teaching at all levels to study humanistic Buddhism has obtained the rich achievement. but the understanding about Connotation and purport is not unification. The key on understanding humanistic Buddhism is that define essence from philosophical level and clarify three aspect questions of content and method and modernity. so on the basis of this,we can define the theory core and idea on humanistic Buddhism what is the ultimate care of Buddha on zi jue jue ta and relieveing the world and building pure land. the idea of humanistic Buddhism present different Characteristics of the times and Characteristics of the region, along with historical and spatial expansion. As a imited beings should practice the Supreme idea following the chance, between the antinomy of rationality and belief.