It is well known that the variety of carbon materials is mainly caused by the bond nature of carbon atoms ; i.e., sp, sp² and sp³. Recently, many studies on carbon materials deal with phenomena between carbon atoms and the other ; e.g., surface modification of carbon fibers, carbon electrodes for lithium ion secondary battery, carbon molecular sieves, new metal carbides, carbon allotropes, etc. These studies are based on alloyed materials among carbon atoms with different bond nature and/or between carbon atoms and the others. To develop a new carbon field in the aspect of alloys, a research committee is established in 1992 in the Carbon Society of Japan. The committee has tentatively defined the term carbon alloys as follows; “carbon alloys are carbon materials mainly consisting of multicomponent carbon atom aggregates. In the materials chemical and/or physical interactions act between each structural unit. Here, carbons with different bond nature are denoted as different components.” In this year we discussed carbon alloys in a view point of the size and space to be controlled. Among the discussion it was cleared that carbon materials are generally one of the alloys with benzenoide and nonbenzenoiode components, even if bond nature of composed carbonatoms are sp² only.