In this paper,we use microwave reduction strategy to synthesize a new bi-functional sulfur host material at the service of cathode substrate for lithium-sulfur batteries (LSBs),the composite is made of hierarchical porous carbon foam supported carbon-encapsulated chromium carbide nano-particles (Cr3C2@C/HPCF),in which the well-distributed conductive Cr3C2 nano-particles can act as powerful chemical adsorbent and are effective in restraining the shuttle effect of lithium polysulfides (LiPSs).Test results show that the Cr3C2@C/HPCF based sulfur electrodes with 75 wt.％ of sulfur exhibit a high initial discharging capacity of 1,321.1 mAh·g-1 at 0.1 C(3.5 mg·cm-2),and a reversible capacity can still maintain stability at 1,002.1 mAh·g-1 after 150 cycles.Even increasing the areal sulfur loading to 4 mg·cm-2,the electrodes can still deliver an initial discharging capacity of 948.0 mAh·g-1 at 0.5 C with ultra-slow capacity decay rate of 0.075％ per cycle during 500 cycles.Furthermore,the adsorption energy between the Cr3C2 surface and LiPSs as well as theoretic analysis based on first-principles is also investigated.