[Objective] To study preservation effects of irradiation on fresh day lily.[Method] Fresh day lily was irradiated by 60Co γ after packaging.Effects of different dosage and dosage rate on nutrients composition were analyzed,as well as the preservation effects.[Result] The nutrient composition of fresh day lily after irradiated by different dosage 60Co γ has no obvious change.Effects of the same dosage and different adsorption dosage rate on nutrient composition are the same.Low dosage irradiation has superior preservation effect than high dosa...