Through the study of the rare earth elements in the high metamorphosed massif of the early Archaean, the granite-greenstone massif of the late Archaean and various metamorphic rocks in the eugeosyncline and volcano-island arc of the late Archaean-early Proterozoic in the east section of the north margin of the North China Platform, the authors conclude that the rare-earth elements in the above three geological periods possess approximately similar evolutionary characteristics and that the partition patterns of the rare-earth elements in similar rock types in different geological periods are about the same, indicating that they were derived from the same source rocks(genesis). However, there are some differences in abundance, Eu-anormaly and degree of fractionation of light and heavy rare earth elements, indicating the heterogeneity of the crustal composition in different geological periods and structural environments in the early Pre-cambrian in the area. The variety of the partition pattern of the rare earth elements in different rock types suggests that there are at least three different magmatic sources, namely, the ultramafic, mafic and the andesitic or the tonalitic-trondhjemitic magmatic sources.