Electronic　structure　design　to　optimize　the　hydrogen　adsorption/desorption　balance　on　the　catalysts　plays　a　key　role　in　improving　the　catalytic　efficiency　of　the　low-load　Pt-based　catalyst　in　the　hydrogen　evolution　reaction　(HER).　In　this　study,　we　modulate　the　electronic　structure　of　Pt　nanoclusters　through　tuning　the　interface　of　Pt/SnO2　clusters　confined　into　nitrogen-doped　porous　carbon　for　enhanced　hydrogen　evolution　catalysis.　Theoretical　calculations　reveal　that　adjusting　the　contact　distance　between　Pt　and　SnO2　generate　stronger　electron　coupling　and　more　free　electrons　transfer　to　Pt,　and　thus　downshift　Pt　d-band　center,　which　balances　the　intermediate　H*　adsorption/desorption　on　the　Pt　site,　thus　accelerating　HER　catalytic　process.　As　a　result,　in　acidic　solution,　the　optimized　catalyst　(Pt/SnO2@NPC-300)　showed　significantly　enhanced　HER　catalytic　activity　with　the　minimum　overpotential　(11.7　mV)　at　10　mA.cm(-2),　the　highest　mass　activity　(4.08　A　mg(Pt)(-1))at　10　mV　and　the　turnover　frequency　(4.13　s(-1))　at　20　mV,　far　superior　to　that　of　Pt/NPC　and　commercial　Pt/C　catalyst.　Our　work　provides　a　reference　for　the　precise　design　of　low-Pt　nanocluster　catalysts　with　high　HER　activity　and　durability.