Abstract: To improve the quality of dehydrated large yellow croakers，the controlled air drying(CAD) processing technology of large yellow croakers was studied. An orthogonal experiment was carried out to optimize the processing parameters. The results show that the optimum parameters are as follows: the optimum dehydrating temperature is 35℃; the gaseous medium has a better restraining effect on the degree of fat oxidation with CO₂ charged into the controlled ambient atmosphere when the oxygen mass fraction was reduced to 12%. Besides, the effect sequence of the dehydrating paramemts on restraining fat oxidation and the preserving qualities of the dehydrated yellow croakers were as follows: dehydrating temperature, gaseous medium, antioxidants.