The evolution of Buddha is relative to the history of Buddhism, although the subject of this article is “From Abhidhamma Buddhism to the eary stage of Mahayana Buddhism”, we have to look back on the history of Buddha. In Buddha’s biography , there are many legends which are almost similar to Brahmanism’s culture, therefore the life background of Brahmanism’s culture in this article are based on the Manava-Dharma Sastra (Institutes of Manu) edited by Mr. 蔣忠新 There are remains (remains ?arīra), classical quotation and sutra (dharma- kāya), representative of personality and spirit (sila, dhyana, samadhi, citta, prajna, jnana, skandha, dhātu, ayatana vimoksa, and vijnana.) had been left after the death of Buddha. Buddha is eternal, Buddha’s dharma-kāya lives forever, and is grieved by successors. One hundred year after the death of Buddha, Buddhists split into two parts: Sthaviravadins（Sthiravada） Mahasanghikas schools. It’s called split in foundation. Then the Buddhists split again and again, at this time the Buddhism is called Schools Buddhism or Abhidhamma Buddhism. Due to different viewpoints of Schools Buddhism’s religious teachings, Schools has different points of view on dharma-kāya, according to《異部宗輪論》, this article analyzes and generalizes Schools’s difference on the viewpoint of Buddha-kāya. Mahasanghikas faction claim perfect Buddha’s body.Buddha-kāya is no frailty. Sarvastivadins faction advocate ordinary Buddha’s body was an actual man living in this world like any other human being and subject to all the frailties of a mortal body. Nāgārjuna Bodhisattva born in the second century, he had a longevity and was erudite. He learned Hinayanists and Mahayanists Buddhism when he grow up, and he preached Mahayana Buddhism finally. To reorganize 《大智度論》regarding II Buddha-kāya of Nāgārjuna Bodhisattva: he reveal with Buddha’s Rupa-kāya, he is eternal.；The Tathagatas dharma-kāya have no origin, they are ever existing and inconceivable. He is shown to people with the Rupa-kāya . Tathagatas dharma-kāya is protean and miraculous, he is all-knowing and omnipotent. The Lotus Sutra Chapter Sixteen: The Life Span of the Tathagatarecord: Sakyamuni has become a Buddha long time ago; the Buddha we knew who has become a Buddha under the bodhi tree was a reveal of Sakyamuni , Buddha is eternal and deathless. Buddhāvata异saka mahāvaipulya sūtra of Vairocana tathā-gata.From this sutra has sorted out three key points:：1、Vairocana tathāgata isWorld of Lotuses。2、tathāgata Buddha-kāya When his body stretched out innumerable rays of light.（skt.Amitābhha）。3、Vairocana tathāgata is same as Sakyamuni。 To generalize Buddha-kāya of Mahayana primary stage : he is dharma-kāya with glorious radiance, longevity and miracle. The key point of turning Buddha-kāya into mystification and holy are time and distance
