Taking Gonggan as the research object, the sensory evaluation, weight loss rate, VC, titratable acid, reducing sugar, soluble solid content and other storage qualities of different concentrations (0.5%, 1%, 1.5%) of chitosan coating were studied. The results showed that 1% chitosan coating treatment can effectively delay the weight loss rate of Gonggan, maintain a higher sensory score, inhibit the content of VC, titratable acid, reducing sugar and soluble solids; after 21 days of storage, Gong The sensory evaluation of citrus, weight loss rate, VC content, titratable acid content, reducing sugar content, and soluble solid content were 6.4, 5.03%, 13.44 mg/100 g, 0.31 g/100 g, 3.36 g/100 g, and 11.95, respectively. %, to achieve the purpose of preservation.

The storage was carried out at 0, 4 and 8 °C three refrigerating temperatures to study the nutritional indicators such as soluble solids, titratable acid, total sugar and vitamin C content, as well as the weight loss rate and sensory evaluation. At 3 different refrigerating temperatures, Gonggan showed that the lower the temperature, the better the nutritional index. The total content of soluble solids varied from 11.4% to 13.5%; the titratable acid content increased from 0.46% to 0.60% to 0.65%; the total sugar content showed an "S" change. The trend of vitamin C content is about the same. The lower the temperature, the smaller the weight loss rate, and the better the sensory evaluation. According to the comprehensive analysis, the preservation effect of tribute at 0 °C was better, and the refrigerating effect at 4 and 8 °C was second.