Here,　an　in　situ　N　incorporation　method　was　developed　to　boost　the　efficiency　and　durability　of　CoMoS4　electrocatalyst　for　hydrogen　evolution.　Theoretical　and　experimental　results　reveal　that　such　modification　not　only　reduces　the　energy　barrier　of　H*　desorption　by　decreasing　the　electron　densities　around　active　metal　sites,　but　also　decreases　the　leaching　rates　of　the　metal　ions　with　enhanced　stability.