Abstract:This essay reviews Marx' s research plan of political economics and Mar' s basic points of inter national value , o n this base the author say s international economics and wo rld economics theo ry is an important part of Marxist economic theory .Under new interna tio nal and econimic situation , we should use Marx' s theory on inter national value to research and ex plain contempo rary eco nomic questions in economicg lobalization and to find out economic law s.