Dose distribution of soybean protein product irradiated by ,60,Co γ-ray with a pile-up irradiation technology was studied. The product bags were irradiated to half dose by the γ-ray source at two positions (low and high), and the second half dose was delivered in the same way to the product after position-change of the bags. Effects of the γ-ray irradiation, which included hygiene quality, physical and chemical index, functions and appearance of the soybean protein product, were investigated. The results show that decontamination of the product can be achieved by 3-5kGy of the irradiation, with improved utilization efficiency of irradiation source and high quality of the product.