导　　言微乳剂是由水以及水不溶物和水可溶物组成的感观均匀和透明的液体。一种或几种有效成分可能存在于水相 ,非水相或两相中。有各种不同的微乳剂 :水相可以看作是分散相 ,或是连续相 ,或者两相被看作是连续的。但不管是那种情况 ,微乳剂都能分散到水中形成一般的乳状液或 Introduction Microemulsions are homogeneous and transparent liquids consisting of water and water-insoluble and water-soluble substances. One or more active ingredients may be present in the aqueous, non-aqueous or two-phase. There are a variety of different microemulsions: the aqueous phase can be considered as a dispersed phase, or as a continuous phase, or as two phases being considered continuous. However, in either case, the microemulsion can be dispersed into water to form a general emulsion or