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The slip agents used to reduce coefficient of friction of polypropylene(PP) film, but it migrate brought the issue of food safety, to reduce of the corona effect and the peel strength of flexible film. We try another method to reduce the coefficient of friction. The result shown that the nano-modification not only reduces the coefficient of friction of PP, but also reduces the adsorption of volatile organic solvent in PP. The coefficient of friction of modified polypropylene was reduced by 50% when the concentration of nano-silica is between 1~2%. The final residues toluene in modified polypropylene was reduced to zero when the concentration of nano-silica in PP is between 1~3%. The modified polypropylene agrees quite well with food safety.