Abstract: Some leaching results about effect of saturation around the solid cementious waste form on leaching of ~(137 )Cs under unsaturated condition are introduced in the paper, including cumulative leaching fraction, F_(t), leaching flux fraction, J_(n), and effective diffusion coefficient, D_(e). The results show that F_(t) increases with saturation, f; J_(n )decreases obviously with time, and increases slightly with f; as well as D_(e) increases with f.