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Pacific Saury (Cololabis Sira) is one of the most important commercial fish species that widely distr-ibuted in the North Pacific Ocean.In order to evaluate the quality of Pacific Saury oil.Supercritical car-bon dioxide (SC-CO2) was used to extract oil from Pacific Saury viscera and the parameters was set at 55 ℃, 45 Mpa, and the extraction time was 4h.For the further studys, the chemical properties including acid value, peroxide value, iodine value and unsaponifiable substance were evaluated.