Abstract: In order to improve the cycle performance of lithium sulphur battery, chemical precipitation was adopted to prepare FeS immobilized mesoporous carbon (MC) composites FeS/MC. S immobilized MC composites S/MC and S-FeS immobilized composites S-FeS/MC were prepared by hot mixing. The SEM photographs show that holes on the surface of MC are filled by FeS; N₂ adsorption-desorption isotherms indicate that after the immobilization of FeS, the specific area of MC decreases greatly, while the average diameter of holes increases. XRD patterns show that when the content of immobilized FeS reaches 20wt%, Fe₃S₄ phase appears. Electrochemical test results show that although FeS immobilized in MC shows no electrochemical activity, it has catalytic effect in the redox process of polysulfides, thus enhances the reversibility of cathode. The retention rate of 2nd specific discharge capacity of S-FeS/MC is higher than that of S/MC, and shows the lighter "shuttle effect". 2nd specific discharge capacity of S-FeS/MC is 1 108.8 mA·h/g, and the capacity retention rate after 50 cycles is 43.7%, which is higher than the capacity retention of S/MC, and shows superior cycle performance.