Abstract: Cenozoic basaltic volcanism in Sino-Korea continental fault block region can be divided into two periods: one is the Paleogene basalts(mostly belonging to continental rift-type basalt)which show the features of both E-type and N-type MOEB caused by strongly extensional lithosphere fractures and the other is the Neogene-Quaternary crack-type basalts within the continental fault block. The latter has geochemical characteristics similar to ocean island basalts on mantle plume. The chemical and isotopic heterogeneity of both the Neogene-Quaternary basalts and their ultramafic xenoliths in the Sino-Korea Fault Block region shows that the mantle heterogeneity during the Cenozoic time. It might be caused by selected mantle metasomatism(mainly on some HYG, LREE elements and alkalis)along the active contact zone between the continental and oceanic fault blocks and stronglier developing in the Miocene and the Pliocene. It seems to have some enriched ocean-like mantle beneath the region during the Cenozoic.