Abstract: With"75"hard jackfruit lines as material, effect of 0, 500, 1 000, 1 500, 2 000 mg/L ethephon (CEPA) on jackfruit maturation were studied in this paper. The results showed that ethephon accelerated the degradation of starch, cellulose and protopectin content, promoted the rise of total sugar, reduced the sugar and sucrose content and advanced the peak of organic acids and Vitamin C. It markedly reduced the protein content of jackfruit in the early storage and improved the protein and soluble pectin content in the late period of storage. In all concentrations, effect of 1 000 mg/L CEPA treatment was the best.