Abstract: Under refrigerated condition,in order to study the optimal gas proportion of the spinach air conditioning packaging environment to extend the period of the spinach shelf life.This experiment chooses nongda bo's miscellaneous 1 as the test materials,with high barrier property of polypropylene film/PE,BOPP/PE) composite film for packaging materials,determination of 5 kinds of spinach weightlessness rate under different gas ratio, vitamin C content, chlorophyll content, relative electric conductivity and other physical and chemical indicators of change,and sensory evaluation.Results showed that the initial gas volume fraction of O₂,CO₂,N₂ were as follows:10%,2%,88%,storage to 18 th d,the sensory evaluation of spinach was 5.5 points higher than that of other groups.The weight loss rate was low,at 0.32%,and the conductivity increased slowly,to 10.25%. At the longest storage period,the total amount of vitamin C in the MA4 group was 1.25 mg/100 g,and the content of chlorophyll was 445.70 mg/kg,while the content of the nutrient content remained high. Conclusion:when the spinach was stored at low temperature,because of the strong respiration,the suitable storage condition was high concentration of oxygen(5%~10%) and low concentration of carbon dioxide(2%~4%).