This article discusses the ocean—continent conversion in the western Pacific Ocean regine. The Western Pacific ocean—continent Transition Zone by eastern China can be divided into three sections: South China, North China and Yellow Sea and Northeast China. The Mesozoic ocean—continent transition in Northeast China involved the influence of subduction in the ancient and modern Pacific Plates and the Mongolian—Okhotsk Ocean Plate, resulting in large areas of medium-to-basic magmatic and volcanic activities, extending from the Jurassic to the present. Different from the northeast and south China, the North China and Yellow Sea regine had a craton-type lithosphere in the Late Jurassic—Tertiary Period. The upwelling of low-viscosity material in the asthenosphere and the large-angle rotation of the Pacific plate caused the bottom the crustal tension and intrusion of mantle source magma, resulting in the upper crustal rift valley sedimentary basin. The Yanshan region was similar to the northeast region in the Jurassic, with strong asthenosphere upwelling and partial melting of lithospheric rocks, resulting in strong magmatic activity. In the Cretaceous to Cenozoic, because of the closure of the Mongol—Okhotsk Ocean and the large-angle rotation of the Pacific plate, there was a transform fault of the Mongol—Okhotsk Ocean stretching, resulting in NW basalt magma and volcanic belts passing through Xilinhot from Southern Mongolia. Different sections of the ocean—continent transition zone have different dynamic evolution processes, which are closely related to the nature of the early lithosphere, the distribution of the subduction zone of the oceanic plates, the direction change and the durations of the subduction, and the retreat of the late subduction zones. The common consequence of the ocean—continent transformation process was the accresion of continents, but the way of continental accresion and material movement in different segments were different.