Abstract:Jiaxing have large area of lotus root cultivation.Elian no.3 matures in July，high temperature accelerate the browning of lotus root，and easy to lose moisture and decay.Screening of preservatives in line with national standards to inhibit the browning of lotus root.To prolong the storage period of lotus root，maintain the quality and commodity value.Choose different concentrations four kinds of preservative reagent of chlorine dioxide，citric acid，VC，CaCl2.After wash lotus root soaking preservative reagent.The determination of lotus root after cold storage 20 days.The color，total sugar，total acid and polyphenol oxidase activity were determined.The browning of lotus root and the activity of PPO enzyme was obvious restrain by 100 mg/L ClO2，1%CA and 0.7%VCtreatment.0.6%CaCl2treatment can maintain good hardness of lotus root.During the storage period，the sugar content was not decreased，andlow decay rate.The total acid content of lotus root was not increased after citric acid treatment.Get good preservation result.