Half a century ago, the wellknown preCambrian crystalline basement outcrops extensively in the southern Northeast China, North China and Alashan Desert of Northwest China, which were considered by T.K. Huang and J.S. Ren as a unitary ChinaKorea Platform. This idea has been being in use until now. Recently, the studies of tectonostratigraphic terrain demonstrate that the ChinaKorea Platform is composed of both the North China Craton and the Huatai Craton, and contains 11 terrains in all. The range of North China Craton redefined was limited within northern and western Liaoning province, Hebei province, main part of Shanxi province, and northern Shaanxi province. The other regions of original ChinaKorea Platform, including southern Jilin province, Liaodong peninsula, Shandong province, northern parts of Anhui and Jiangsu provinces, Henan province, the Shaanxi plain and the Alashan DesertHelan Mts. constitute the new established Huatai craton. The boundary between two cratons and adjacent Paleozoic organic belts are separated by a series of large faults. The North China Craton is the initial continent crust in whole China, which is composed of 4 terrains, including the Yanliao continent block, Jinji orogenic belt, Mengshan continent block and the Yinshan rift belt. The North China Craton originated from the late Paleoproterozoic (1850Ma) orogeny and collision, which resulted in assembly of the former 3 terrains and finally solidification of the craton. The Yinshan rift belt occurred in Mesoproterozoic and was the remains of separation of North China Craton and Siberia Platform. The prominent features of North China Craton are the unconformity between Paleoproterozoic Hutuo Group and Mesoproterozoic Changcheng System, and the deposition of Mesoproterozoic caprock represented by the Jixian profile. According to these characteristics, only Siberia Platform and Canada Shield in the world are comparable to this craton. Over the crystalline basement of Huatai Craton, the first unconformity between PalaeoMeso Proterozoic Liaohe Group and Neoproterozoic Xihe Group marked its solidification in about 1000 Ma. Therefore, the origin of Huatai Craton can be traced in the world. It is quite evident that Rodinia was a united ancient continent in Neoproterozoic. In view of Cambrian stratigraphic studies in China, it is believed that the assembly between North China Craton and Huatai Craton occurred at the beginning of the Middle Cambrian (about 536 Ma). Before Middle Cambrian, two cratons belonged to different ancient continents and had never been jointed. Therefore there was no united ChinaKorea Platform during the period from Archean to early stage of Cambrian.