Abstract: The core-mantle boundary (CMB) is the greatest contrasting and the most important boundary in the interior of Earth, where core-mantle interactions have been playing an important role in earth’s geodynamics system. On the basis of outlining the basic features of CMB, this paper presents systematica1 summaries of the research results and related problems on the following aspects: the material chemical reactions and forming of D″1ayer, mass transfer between core and mantle; heat transfer from core to mantle and their contribution to mantle convection; and core-mantle coupling and angular momentum transferring.