Abstract: The effects of bleeding sap of sponge gourd as a fresh-keeping agent on Pleurotus citrinopileatus are studied．The results show that the bleeding sap of spo nge gourd used as a fresh-keeping agent can effectively weaken the respiratory metabolism and decomposition of Pleurotus citrinopileatus，obviously inhibit the pileus split，browning and loss of water．The fresh-keeping effect of ridged sponge gourd(RSG)bleeding sap is better than that of unridged sponge gourd(USG) bleeding sap．Of all the treatments，75％bleeding sap of ridged spo nge gourd has the best fresh-keeping effect．