Nanoporous tin with nanosheet arrays and nanoparticle were successfully prepared by dealloying in corrosion medium using Mg89Sn11 as precursor alloy. The morphology and structure of nanoporous tin and the process of dealloying were investigated by adjusting the corrosion medium and corrosion time. The results show that in acidic corrosive medium it can obtain a bicontinuous nanoporous tin structure. Among them, the pore walls are constituted by discontinuous nano-spherical particles in the 0.1% H₃PO₄ solution, while in the 0.1 mol/L HCl and neutral NaCl solution the pore walls are the nanosheet structure, forming a nanosheet array of porous tin. With the extension of the dealloying time, the porous morphology changes from a uniform nanosheet array porous to a cluster-like nanoporous morphology in 5% NaCl solution. The porous structure on the surface grows from uniform nanosheet array to discontinuous clusters with the corrosion time from 1h to 6h, and finally evolved into a continuous undulating sheet-like nanoporous structure with the average pore size of 50nm. Nano-porous tin structures with different morphologies were prepared by adjusting the dealloying process.