Abstract: This paper describes the standard κ-ε model which is one of the most prominent turbulence models based on the computational dynamic fluid (CFD) codes and its numerical methods are discussed. A successful attempt is presented in this paper that the CFX simulation software is applied to the analysis of local oil-gas diffusion. The concentration surface of oil-gas, diffusion vector graph and plane streamline are all formed in CFX, which is helpful to the analysis of the hazard regions qualitatively around gas fountains and offers theoretical considerations for further control measures.