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Herein, four nanochannels of similar components and structures but various sizes were constructed, and the transport manners of typical cations were tested for analyzing the effects of size\u2010related dehydration process. Notably, dehydration extent reversed the ion transport rates in the nanochannels, while the trans\u2010membrane energy barrier increased until a plateau was reached with the shrinkage of pore sizes, where the transformation from dehydration to deformation occurred in ion partitioning into the membrane pores as evidenced by theoretical calculations. Through quantitatively assessing sieving\u2010related features of channels and cations, a correlation relationship between trans\u2010membrane energy barriers and physical pore\u2010ion parameters was obtained and then effective dehydrated sizes were calculated accordingly for replacing Stokes radius in diffusion description models. 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