Abstract: Platinum （Pt） is the state-of-the-art electrocatalyst towards hydrogen evolution reaction （HER）,but its atom-utilization efficiency and durability need to be further improved.In this work,we prepared the highly dispersed Pt atoms supported on defects-rich Ru nanoparticles substrate （Ru NPs@Pt） by substrate-enhanced electroless deposition method.The results of single electron paramagnetic resonance confirm the existence of the defects on Ru NPs substrate and the X-ray diffraction combined with transmission electron microscopy reveals the highly dispersed Pt atoms.Exchange current density of HER on the Ru NPs@Pt is up to 2.39 mA/cm~2,which is significantly higher than that of commercial Pt/C,demonstrating the boosted HER intrinsic activity.Mass activity is as high as32.34 A/mgPt that is 9.37 times higher than that of Pt/C at an overpotential of 50 mV.Significantly,the Ru NPs@Pt delivers the greatly enhanced durability in comparison with the Pt/C one even under the ultralow Pt loading （2μg/cm~2）,indicating that the defects-rich Ru NPs substrate could improve the electrocatalytic activity and durability of Pt simultaneously.