SnO2 hierarchical architectures were synthesized with a surfactant-free hydrothermal synthesis route. We found that the acid or alkaline amount (HCl or NaOH) of the solution had a remarkable effect on the morphology of as-synthesized products. The SnO2 nanostructures were selected as a support of Pt catalyst (Pt/SnO2) for hydrogen evolution reaction (HER) in the acidic media. The influence of SnO2 morphologies on the electrochemical performance has been investigated by cyclic voltammetry and linear sweeping voltammetry using the rotating disk electrodes. In addition, the effect on the catalytic activity in different electrolyte concentration was taken into account. Kinetic study shows that the HER on the Pt/SnO2(flower) electrocatalyst gives a higher exchange current density and a lower overpotential in H2SO4 solution with high concentration. Tunable synthesis of SnO2nanostructures has been achieved via hydrothermal method without using any surfactants. The SnO2nanostructures have been used as multidimensional frame for loading Pt nanoparticles for hydrogen evolution reaction.