Abstract: This study performs the quantitative analysis and comparison to acoustic signal characteristics of Large Yellow Croaker(Pseudosciaena crocea) at two different ages.The sounds were recorded from the fishes in a net-cage. Two exponential oscillation functions are built to fit the acoustic signal of the fishes.The signal characteristic of the oscillation frequency and attenuation coefficient was described quantitatively.Simulation curves of the function could fit well acoustic signals.Both the average oscillation frequency and attenuation coefficient of the fitted signals from the 13-15-month-old fishes are lower than those from the 7-8-month-old fishes.The results suggest that the oscillation frequency and attenuation coefficient of the acoustic signal function may be relevant to the physical process of sound production and age characteristics of Large Yellow Croaker.This study may be valuable for the acoustic application to the artificial culture of the species.