With the continuous appearance of jades associated with jadeite, the researches on the genesis and synthetic technology of jadeite are facing new challenges and opportunities. The existing National Standard of Jadeite Nomenclature has become too broad, and it is difficult to distinguish jadeite in the traditional concept from its transitional species, which would hinder the healthy development of the market. In addition, more and more studies show that in the subduction zone of high pressure, jadeite is spatially and temporally related to other high-pressure rocks such as ureyitite (jade), omphacitite (jade) and groeclogite. The authors believe that the diversification of rock zonation and lithology of these high pressure rocks can be attributed to the metasomatism that took place between deep melt and ultrabasic rocks in the subduction zone, and thus propose a hypothesis of subduction melt metasomatism to explain jadeite formation. It is held that the subduction zone, deep melt and ultrabasic rocks constitute three necessary conditions for the formation of jadeite and its transitional varieties. It is also thought that the introduction of fluid phase in the synthesizing process can possibly alleviate the harsh conditions of high temperature and high pressure reaction and hence realize the successful synthesis of commercial jadeite.