Abstract: In order to discuss the effect of high carbon dioxide treatment on shelf life of sweet persimmon in Baoshan region, the paper firstly studied the relationship between sweet persimmon fruit quality and shelf life so that a fast and accurate grading standard can be made. Then with the grade of sweet persimmon as a assessment index discussed the effect of different durations of high carbon dioxide treatment on shelf life of sweet persimmon. The results showed that: The hardness value was the most relevant quality index to the shelf life of sweet persimmon and can be used as the fastest and most direct basis to evaluate the grade of sweet persimmon. High carbon dioxide treatment was better for prolonging the shelf life of sweet persimmon.And the processing time is longer, the shelf life longer. The shelf life of sweet persimmon treated by carbon dioxide for 0、4、6、8、10、12 hours were respectively 6、16、20、28、36、45 days.