Abstract: In order to slow down the oxidation of hazelnut oil and prolong its storage period,this study used chitosan and beta cyclodextrin as composite wall material,linseed gum as emulsifier,and emulsion polymerization method combined with freeze-drying method to hazel oil. Microencapsulation was carried out and the optimum process conditions were obtained by single factor and response surface optimization. The results showed that the encapsulation rate of microcapsules was 72.89%±0.58% when the mass fraction of solid was 25%,the emulsifying temperature was 60 ℃,the ratio of wall core material was 2:1 and the content of emulsifier was 0.34%. The morphology of microcapsules observed by freeze scanning electron microscopy showed that the microcapsules were regular spherical,and the encapsulation effect was better. The method was proved to be effective. It can effectively improve the embedding rate of hazelnut oil microcapsules.