This paper contains two aspects: 1) The influence of montmorillonite on mechanical properties、thermal degradation、thermal oxidation、the gas barrier properties of Polypropylene;2) The influence of compatibility agent,temperature,viscosity,organic modified agent,MMT content on the dispersion of montmorillonite in polypropylene.In the end,the foreground of research and application of polypropylene/ montmorillonite nanocomposites was made.