In the present study the combined effects of ozone(O₃)sterilization and modified atmosphere packaging on the quality of Sinonovaculla constricta Lamark were assessed by physicochemical and microbiological methods. S.constricta Lamark were sterilized by ozone(1 mg/L)and packaged by modified atmosphere,then stored at (0±0.5) ℃.There are six groups in the experiment:low oxygen MAP(60% CO₂+10%O₂+30% N₂),non-oxygen MAP(60% CO₂+40% N₂),air packaging,low oxygen MAP(60% CO₂+10% O₂+30% N₂)+O₃,non-oxygen MAP(60% CO₂+40% N₂)+O₃,and air packaging+O₃.The microbiological analysis showed that the total viable counts(TVC)for air packaging group and air packaging+O₃ group reached 1.76×10⁷ cfu/g and 1.14×10⁷ cfu/g on day 4 and 8 respectively,while the TVC for low oxygen MAP group and non oxygen MAP group reached 1.87×10⁷ cfu/g and 1.03×10⁷ cfu/g respectively on day 10,exceeding the microbiological acceptability limit.The results indicated that the combination of low oxygen MAP and O₃ could extend the shelf-life of S.constricta Lamark up to 12 days,while the combination of non-oxygen MAP and O₃ could extend the shelf-life up to 14 days.TVB-N,K value,sensory evaluation,pH changes for each group were also associated with the storage time(P<0.05),TVB-N,K value,sensory score and pH value for MAP+O₃ group showed better effects than single MAP or ozone group.The preservation effects of nonoxygen MAP(60% CO₂+40% N₂)+O₃ group were better than other groups.TVB-N,K value,and sensory score reached 14.952 mg N/100 g,55% and 5,respectively,at the end of shelf-life(14 days),which indicated a moderately fresh or acceptable status of samples.Thus,it was suggested that the combination of ozone sterilization and modified atmosphere packaging could effectively extend the shelf-life of S.constricta Lamark during refrigerated storage.