The fresh-keeping effects of chitosan derivative—carboxymethyl chitosan(CMC) and chitosan coating on postharvest Lentinus edoes were investigated during storage.The indexes of sensory quality,weight loss percentage,respiration rate and cell membrane penetration,the contents of reducing sugar,malonaldehyde(MDA),vitamin C and polyphenoloxidase activity were all analyzed at 4℃ storage.The results showed that CMC coating had the best preservatives effects on decaying inhibition and color change;CO2 respiration reduced,the penetration ability of cell membrane diminished,the content of malondialdehyde reduced,PPO activity and the rate of water loss reduced.Meanwhile,reducing sugar and Vc content reduced significantly.The sensor and nutrient quality were better if Lentinus edoes were kept at 4℃.