Driving by the lower cost and better properties, the development of new positive electrode materials of Li ion battery has been paid more attention by the researchers. It is not occasional for most of positive electrode materials to have a layer type or tunnel structure. In this paper, a brief presentation on the situation of positive electrode materials was done, based on which the fundamentals to improve the positive electrode properties and to find new type materials were proposed. The necessary requirement is to have layer type structure and/or tunnel structure.