Abstract: Polyethylene plastic mother partic les added with silver -contained nan o material were added to conven-tionalLDPEresin,A plastic filmofp rotectionagainst mouldwas manufac tured,inwhichthe diameter ofnano m aterial was from40to70nm.Theresultsshowe dthatthegraymouldinoculatedPDA c ulturalmediumweretreatedinbothr ound filtersubmerged intheextractofmo therparticles addedwith(w /w)silver -containednanomaterialof4%(w /w)and also in the round plastic filmwith silver -containednano material of4%(w /w)and cultivatedat26～28℃constant temperature.The inhibiting effect of the former increased by 72.7%and t he later increased by 67.9%in comparison with CK.

Key words: Silver-contained nano material, Polyethylene film, Gray mould, Freshness-Keeping