Leather products occupy an improtant place in the natiol economy. In order to prevent from mildewing of leather products in storage, transportation and sale, the packed shoes were irradiated with ,60,Co ,γ, ray. Test materials are cattle, sheep and pig leather ,shoes., The results shows that: 1. There are 11 types of molds which make leather shoes mildewed: Oospora sp, Rhizopus oryzae Went and Grrelings, Aspergillus flavus Link, Aspergillus terreus thom, Monilia sp, Botrytis sp. Aspergillus niger V. Tiegh, Penicillum Lividum Westling, Penicillum Corylophilum Dierckx, Penicillum Cyaneum (B. and S.) Biourge and Penicillum Verrulosum Peyrone. 2. The three types of shoes packed with polyethylene film can be prevented from mildewing after irradiation at level of 12 kGy. 3. The irradiation at 30 kGy does not change the physical properties of the shoes. 4. The irradiated shoes packed with polyethylene film can prevent mildewing, but unpacked ones would be mildewed again.