Abstract: For the "Zaosu" pear etiolation and softening, corruption deterioration phenomenon, this paper studied in the same storage temperature (0±1)℃, relative humidity 90%~95%, set 1%~8% O₂+1%~9% CO₂ of different gas components, conduct CA storage experiment. The effects of different gas components on the respiration rate, ethylene release rate, hardness, color difference, titratable acid content and soluble solid content during the 240 d storage were studied, so as to optimize the appropriate atmospheric components of pear. The results showed that nine kinds of modified atmosphere storage conditions had an impact on the physiological indexes during the storage of "Zaosu" pear. Treatment 2 had a significant effect on preserving the solid content and reducing the ethylene release rate during the storage of "Zaosu" pear, treatment 3 could significantly reduce the "Zaosu" pear refreshment, ethylene release rate, maintain its L^* value, soluble solids content and good fruit rate, treatment 6 had a significant advantage in reducing the respiration rate, maintaining the hardness, soluble solids content, titratable acidity and good fruit rate.In short, treatment 2 (3%~4%O₂+1%~2% CO₂), 3 (5%~6% O₂+1%~2% CO₂), 6 (5%~6% O₂+3%~4% CO₂) could make the ‘Zaosu’ pear to maintain good physiological and appearance quality during storage, and the effect of treatment 3, 6 was better.