Abstract: Tuna is favored by modern people because of its delicious meat and rich nutrition. And the nutritional quality of tuna is closely related to preservation methods.The paper summarized several fresh- keeping methods such as modified atmosphere packaging preservation, freezing preservation, freezing- point preservation, superchilling preservation, quality varity law and its evaluating indicator including colour, Texture, K- value, pH, TVB-N, microbiological values and so on, which provided a certain theoretical basis for tuna preservation technology development and innovation.