Herein, few-layer Ru nanoparticles@templated-free N-enriched nano-sphere carbon (Ru-NPs@TNNC) with very high surface area were prepared by a simple method. Poly(butyl acrylate)-b-Polyacrylonitrile (PBA-b-PAN) block copolymer, synthesized by atom transferred radical polymerization(ATRP), were dissolved in dimethyl sulfoxide (DMF) with ruthenium(III) acetylacetonate, an organic ruthenium precursor, and then pyrolyzed followed by electrospinning. In this process, ruthenium precursor are confined in polymer network, which restrict Ru-NPs to be aggregated during the pyrolysis process, and ultimately few-layer Ru-NPs@TNNC is produced. As prepared Ru-NPs@TNNC containing mesopore/micropore shows very high capacitance of 656.25 Fg‒1 at 10 mVs‒1 with retained 88.11 % of capacitance at 100 mV s‒1. This high capacitive behavior is attributed to self-doped graphitic nitrogen and few-layer Ru-NPs