Abstract: In this paper, the interface phenomenon including solidliquid, liquid-gas and gas-solid of krypton is studied by means of the molecular dynamic computer simulation method. It is shown that the zero radial distribution of liquid is arranged in order, atoms at the side of the liquid near the interface of solid-liquid have similar-crystal structure, and at the surface of solid there is an absorptive layer with gases. The result of surface tension obtained is in agreement with the experimental data. This fact s...