Abstract:Blood orange is a citrus variety of the rutaceae family.It is widely grown in Neijiang，Sichuan，and has a large annual output.Blood orange peels are a by-product of the squeezing of blood oranges.They contain a variety of active ingredients and are rich in resources.Blood orange peels were used as experimental materials and polysaccharides were extracted using decompression internal boiling.The response surface method was adopted to optimize the extraction process.Under a pressure of 38 kPa，when the ethanol volume fraction was 55%，the liquid-to-material ratio was 35 mL/g，the extraction temperature was 80 ℃，and the extraction time was 10 min，the polysaccharide yield reached 28.6%.The experiments showed good reproducibility and high polysaccharide yield，which has reference value for the development and utilization of polysaccharides in blood orange peels.