Abstract: To provide scientific evidence to evaluate the behavior of ⁹⁵Zr in ocean ecosystem,the dynamic model of the transference,accumulation and disappearance of ⁹⁵Zr among the simulated marine water,sediment and organisms was investigated using Nassarius semiplicatus and Boleophthalums pectinirostris as experimental stuffs. The result showed that ⁹⁵Zr(Bq穏^-1 or Bq穖l^-1) in the marine water was decreased more than 90% in the first 4 h,and then descended gradually. ⁹⁵Zr in sediment was increased th the peak in 48 h and then declined. The radioactivity percent of ⁹⁵Zr in the shell and muscle of Nassarius semiplicatus was 68.7% and 31.30% respectively,while the radioactivity percent was 22.80%,12.64%,34.82%,10.31%,4.48%,11.55% and 3.71%,respectively in the fill,fin,viscera,skull,skin,vertebra and muscle of Boleophthalmus pectinirostris.Nassarius semiplicatus had a greater concentrating capability of ⁹⁵Zr than Boleophthalmus pectinirostris . The order of the ⁹⁵Zr concentration was found to be sediment > Nassarius semiplicatus> water> Boleophthalmus pectinirostris .Adynamic model of closed four compartment was constructed with exponent functio

Key words: ⁹⁵Zr, Marine environment, Marine organism, Sediment