Abstract: The iaterfacial adsorption characteristics of primary amine N₁₉₂₃in liquid-liquid extraction systems have been studied. It may be concluded from the experimental results that N₁₉₂₃is adsorbed at the interface in the form of single-molecule. The adsorbability depends on the temperature and the nature of diluents. The experimental results showed that the weaker the polarity of diluent, the stronger the adsorability, and the higher the temperature, the weaker the adsorability. The influence of the aqueous medium concentration on the interfacial adsorption characteristics is not very obrioas. The relation between the adsorption properties of N₁₉₂₃and its extractability also discusied.