Polypropylene film is used widely in electric devices due to its higher mechanical and better electrical properties. It is necessary to improve the high temperature resistance and other physical as well as chemical electrical properties of the polypropylene film in order to keep the electric devices made of polypropylene film to be used in extreme environments（such as high temperature）. However，there are many factors influencing the high temperature resistance and other physical as well as chemical electrical properties of polypropylene film. In this paper，the micro-factors（including the isotacticity）of the polypropylene film is taken as the research object with purpose of researching the influence of the micro-factors（including the isotacticity）on the properties of the polypropylene film and providing test data support for performance improvement of power capacitor.