Abstract: The adsorption process of star-polymer at oil-water interface was studied by dynamic Monte Carlo simulation.Research findings show some static and dynamic nature of the adsorption process,including the number of chains at oil-water interface,thickness of the interfacial member,interfacial tension of oil-water interface and time needed for the system to reach its final equilibrium.The research demonstrates that the number of star-polymer adsorbed at oil-water interface is determined by the structure and number of star-polymer in the system.The interfacial member formed by star-polymer is unsymmetrical and its thickness is determined by the structure and number of the star-polymer in the system together.Time needed for the system to get its final equilibrium is related to the number of star-polymer in the system and its structure.Star-polymer has higher interfacial activity when the length of its branch is longer and when it has more branches.