Abstract: In order to study the adsorption kinetics of key nuclides from nuclear power plants on marine sediments, the adsorption kinetics curves of ⁹⁰Sr, ¹³⁷Cs, ⁵⁴Mn and ⁶⁰Co on three kinds of sediments were obtained by static batch experiments. The experimental data were fitted by multi-stage adsorption kinetics model. The  distribution coefficients(Kd) of ⁹⁰Sr, ¹³⁷Cs, 54Mn and ⁶⁰Co on the three sediments are 1.8-3.0, 71.5-128.0, 23.1-167.0, 160.0-188.0 mL/g, respectively. The Kd is good agreement with the experimental data, indicating that the adsorption behavior of three sediments can be characterized by the first-order adsorption sites. The key parameters of adsorption kinetics were obtained, including adsorption rate constant, desorption rate constant and maximum adsorption capacity per unit.