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The study of petrology and element geochemistry indicated that there were aluminous A-type granites during Late Triassic in the Wuying --Tangwanghe area of eastern Heilongjiang Province�� The granites are composed of syenogranite-alkaline feldspar granites and alkaline granites��equivalent to the late-collision extension proposed by Liegeois��indicating the ending of orogenic event and the beginning of new interaplate environment�� The whole rock Rb --Sr isochronal age shows the granites formed in Late Triassic��representing the post-orogenic extension of Jiamusi plate and Songnen --Zhangguangcai plate along with Jiayin-Mudanjiang suture zone during Late Triassic�� which indicated the ending of the evolvement of Paleo-Asia Ocean structural zone��and the begining of eastern Heilongjiang into the interaplate evolution of littoral-Pacific structural zone��