Lithium-sulfur (Li-S) battery is a potential energy storage technology with high energy density and low cost.However,the gap between theoretical expectation and practical performance limits its wide implementation.Herein,we report a nitrogen-doped porous carbon derived from biomass pomelo peel as sulfur host material for Li-S batteries.The hierarchical porous architecture and the polar surface introduced by N-doping render a favorable combination of physical and chemical sulfur confinements as well as an expedite electron/ion transfer,thus contributing to a facilitated and stabilized sulfur electrochemistry.As a result,the corresponding sulfur composite electrodes exhibit an ultrahigh initial capacity of 1534.6 mAh g-1,high coulombic efficiency over 98％ upon 300 cycles,and decent rate capability up to 2 C.This work provides an economical and effective strategy for the fabrication of advanced carbonaceous sulfur host material as well as the significant improvement of Li-S battery performance.