Abstract: The growth characteristics of jellyfish (Rhopillema ascuLanta) which habitats in Liaodong Bay was studied and discussed. The results obtained with regre-ssion method are as follows:1) The relationship between the arch length of the individuals of jellyfish (L_t) and their total weight ( W_t) may be described with an equation as W_t=0.3932L_t^2.4 2) The relationship between the arch length and the diameter of the jellyfish(D_t) is linear and the regression is D_t=0.57+0.49L_t 3) The relaLianship between the weight of the umbrella-hart of individuals of jellyfish (W_s) and their total weight is linear, t.oo. The erination is W_t=1. 7743W_s一1775 4)The comgrowth pattern of jellyfish is different from that of fishes and shrimps. Since the grow of jellyfislz shrink after the first ten--day period of Septem-ber without asymptotic values, it is impossible to sliow the growth pattern of jelly-fish by means of regular asymptotic growth equation. Its growth pattern mav be rlesr-cribed with .polynomial expression as a function of time, via. L_t=4.2198+0.4146+0.2203t²+0.03824t³一0. 002249t⁶ in which,t and L_t= designate respectively the. time and arch length of jellyfish,the time unit is five-day. on this basis, the growth rate and growth pattern function of time is discussed.