The structure and the structural transformation of the microemulsions were investigated by DSC method. The existing position of SudanⅡ was determined by melting point of the different component. The shape of microemulsions droplets was measured by transmission electron microscope (TEM).The microstructures of microemulsions were determined through conductance. These results indicated that the microemulsions were partitioned as W/O, O/W, LC and B.C. microemulsion domains. Differential scanning calorimeter (DSC) curves were significantly different because of different type microemulsions. Along with the increase of water content, the systems inverted from water-in-oil to oil-in-water in 10��1 microemulsion. As the water content is less than 30%, DSC curve did not change significantly in 7��3 microemulsion. SudanⅡparticles were exsited in the oil phase of oil-in-water microe-mulsions.%采用差示扫描量热法鉴定微乳的类型及微乳中水存在状态；通过对不同组分中苏丹Ⅱ熔点测定，推断体系中苏丹Ⅱ存在位置；通过透射电镜观察微乳形态；采用电导法划分微乳液类型。结果表明，微乳液为均匀球状液滴。通过电导法可将微乳分为W/O微乳区、O/W微乳区、LC液晶区和B.C.双连续区。不同类型的微乳热分析曲线不同，10��1微乳液随水分含量的增高体系由W/O型微乳液转变为O/W型微乳；体系中水存在状态由束缚水过渡到自由水。7��3微乳含水量小于30%时热分析曲线无明显改变。苏丹Ⅱ在水包油型微乳中被包封在月见草油中。
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