A packaging carton based on modified atmosphere packaging (MAP) technology was put forward and designed. The influencing rule of MAP on transpiration of postharvest apples was studied by comparison experiments, and the mathematical model and its parameters of the transpiration of postharvest apples in MAP system were established. The experimental result and numerical analysis showed that the MAP with corrugated box and the PET/Al film can inhibit transpiration and reduces transpiration rate, and reach the equilibrium of water vapor. Moreover the transpiration of post-harvest can better restrained while the relative humidity within in MAP system is higher than 90%.