In Wandashan area of Heilongjiang Province, developing subduction accretionary complex and Cretaceous accretionary arc, many gold, copper, tin and polymetallic deposits (points) were found, which record the subduction-accretion process and metallogenic events of the ancient Pacific plate, and are the key areas to explore the geological reconstruction and mineralizatio in Northeast Asia. The author and others systematically combed the chronology and structural property characteristics of the matrix and rock blocks in the subduction accretionary complex zone, restored the Cretaceous accretionary arc TTG rocks, summarized the igneous characteristics in the metal deposit mining area, and then reconstructed the geology of the ancient Pacific ocean plate and discussed the mineralization. The results show that: ① from west to east can divide the late Permian, Triassic, Jurassic, early Cretaceous subduction accretionary complex, It records the geological evolution of the ancient Pacific ocean plate; ② The TTG rocks of the early cretaceous accretionary arc in the middle stage T2G1G2 was mainly G1, and in the late stage was mainly G2, With the trend of volcanic arc granite to the plate granite, It is revealed that the ancient Pacific ocean subduction plate recurred in the late Early Cretaceous; ③ The igneous rocks related with metallogenic were concentrated and formed in the late Early Cretaceous, Related to the subduction and rollback event of the ancient Pacific plate, With high grade type I granite and high strontium low yttrium medium acid rock (Adakite, It was also translated as adakite) mainly, formed from the remelting of intra-oceanic arc crust or partial melting of subducted oceanic crust in the geological evolution of oceanic plates .