Buddhism’s determination of the good and evil is first based on the Origin Theory, which counter proves the good and evil of an act by the joy and sorrow of its result. According to Hinayana Buddhism, the good and evil of causality, joy and sorrow can not go beyond the individual self false ego, so they can’t escape the transmigration of life and death of the tree realms and six realms of existence, only to break the individual ego can get out of the cycle of life and death. Mahayana Buddhism further thinks life and death as absolute evil, while Nirvana as absolute good, which is still a false ego. We must be based on the emptiness of people and dharmas and ultimately achieve the complete transcendence of good and evil.