The aim of this paper is twofold. Firstly, through the structure of the Bodhisattva as Mahakaruna and Prajna we try to clarify the possible doctrinal relation between Hua-yen Buddhism and Tien-tai Buddhism. Since Bodhisattva is the concrete manifestation of the spirit of Mahayana Buddhism that Mahakaruna and Prajna are not separated from one another, the difference between Hua-yen Buddhism and Tien-tai Buddhism cannot be over emphasized. Although Hua-yen Buddhism stresses the eschatological truth and Tien-tai Buddhism the passion for the suffering present world" they presuppose one another. Secondly, likewise, the doctrinal relation of Wolfhart Pannenberg and Jurgen Moltmann can be understood in the same way that they are not mutually exclusive. On the one hand, Pannenberg's eschatological truth avoids the trap of meontological subjectivity. On the other hand, Moltmann's suffering cross saves the eschatological truth from any sort of formalism of the truth. It is through the structure of the Bodhisattva as Mahakaruna and Prajna that we point out that a kind of Mahayana Theology can be developed through a kind of Mahayana Christology.