Abstract:The use of ozone can effectively degrade pesticide residues in foods，which has been confirmed by many scholars.Ozone has strong oxidizing properties，and in the process of degrading，various free radicals were generated，such as·OH，O2-·，etc.Whether the self-nutritional value of ozone-degraded food after pesticide residues was affected by these free radicals，few people pay attention.This test was to explore whether the nutrients of foods after ozone degrading pesticide residues was affected，the changes of water，ash，crude fat，crude protein and total sugar before and after ozone degradation were measured by color clams.The test results showed that the five nutrients did not differ significantly before and after ozone degradation.In the amino acid composition，the content of essential amino acids increased，and the umami amino acids decreased.Among the fatty acid compositions，unsaturated fatty acids had an oxidation phenomena，but the results were also within an acceptable range（relative errors were less than 10%）.Ten minerals and four vitamins were measured，no significant changes were observed.Therefore，ozone degrading pesticide residues will not have a great impact on the nutritional value of food，and will not cause the loss of nutrients.