Ｃｓ在海水－底质系统中的转移遵循一级反应动力学模式，盐度能抑制底质对１３４Ｃｓ的吸附率；海藻能迅速累积海水中的１３４Ｃｓ；盐度对海洋生物累积１３４Ｃｓ有明显的影响，这种影响可用指数函数来表达．由于拮抗作用，盐度能抑制海洋生物对１３４Ｃｓ的累积；１３４Ｃｓ在共生体系中的分配是不均匀的，底质的加入可吸附海水中４０％左右的放射性，而海洋生物只累积１％左右． The migration of Cs in the seawater-sediment system follows the first-order kinetic model, and salinity can inhibit the adsorption rate of 134Cs by sediment; the seaweed can rapidly accumulate 134Cs in seawater; the salinity has a significant effect on the accumulation of 134Cs in marine organisms , This effect can be expressed using exponential function. Due to the antagonism, salinity can inhibit the accumulation of 134Cs in marine organisms. The distribution of 134Cs in the symbiotic system is not uniform. The addition of sediment can absorb about 40% of the radioactivity in seawater, while the marine organisms only accumulate about 1%.