Abstract: The paper concerns in the two kinds of radionuclide shore/beach sediment models at present, NRC and IAEA shore/beach sediment models. Some existent questions in the two models are pointed, and a recommendable model is put forward, in which the thickness of sediment layer is replaced by the reciprocal of attenuation coefficient 1/μ. In addition, some recomendations on model parameters choice are given in the paper.