Abstract: When selecting filtration medium there esits certain blindness in some cases,which is not benefit for the research and development of fabric filtration medium, so this paper has proposed a method for optimizing the selection and design of fabric filtration medium by computer simulation.It predigests the complex configuration of filtration medium first,and then produces the fictitious filtration medium by computer simulation.By setting different characteristic parameters of fabric filtration medium configuration,the collecting efficiency and pressure drop of filtration medium are computed so that the selection and design of filtration medium can be optimized on the basis of the dust particle diameter which can be collected by the filter medium.