Abstract: Neo-keynesian economics arisen in the 1980, is a school of economics in the West. Generally speaking,it can be divided into three main sections, that is, nominal rigidity section, real rigidity section and non-rigiditysection. This paper systematically discusses the main ideas of and relations among those sections. Neo-keynersian economics strestses the micro-base of unemployment and business fluctuations. Compared with traditionalKeynesian macroeeonomics, this is undoubtedly a great progress. However, most New Keynesians were onlysatisfied with an explanation about the appearance of involuntary unemployment and business nuctuations, butcould not find a solution. The theories offered by this school always bears charactristics of one-sidedness andvulgarity. Neo-keynesian is in the course of development. In fact. it is only a hotchpotch of various sectionsand ideals.