Abstract: The concept and definition of microemulsion phase are put forward based on the interfacial sciences and the separation principles of chemical engineering.The characteristics,classification and instrumental analysis techniques of microemulsion phase are summarized.Some comments on the technologies of microemulsion phase extraction are presented，including its properties，rules and interaction relationships.In the cases of typical microemulsion phase extraction，micelle，reverse micelle and three-phase are reviewed，and some proposals on the development and prospect of the microemulsion phase extraction technology are provided.