Abstract:To prolong the shelf-life of Pampus argenteus, three kinds of fresh-keeping agent with better preservation effect were screened out from chitosan, sodium alginate, gelatin and Nisin, then the optimal component proportion of compound fresh-keeping agent was determined by the orthogonal test. The results indicated that three ingredients in the compound fresh-keeping agent have different influence on the effect of preservation, chitosan had extremely significant effect and sodium alginate had significant effect but the effect of Nisin was not obvious. The optimal proportion of compound fresh-keeping agent was chitosan 5 g·L-1, sodium alginate 7 g·L-1 and Nisin 0.3 g·L-1, respectively. Coated with the compound fresh-keeping agent, the shelf-life of Pampus argenteus could extend to 13 days, which was longer by about 7 days than that of control group. This compound chitosan coating agent has a good preservation effect, which can provide theoretical basis for the preservation and quality control of Pampus argenteus.