Metal　sulfides　have　been　regarded　as　promising　anodes　for　potassium-ion　batteries　(PIBs)　due　to　their　high　theoretical　capacities,　while　the　performance　is　limited　by　their　intrinsic　poor　conductivity　and　large　volume　fluctuation　during　the　insertion/extraction　of　large　potassium　ion.　Herein,　the　battery　performance　of　iron　sulfide　anode　is　significantly　enhanced　through　yolk-shell　(Y-S)　structure　design　and　nickel　doping,　aiming　to　realize　good　structure　stability　and　superior　electron/ion　transportation.　For　potassium　storage,　as-prepared　Y-S　Ni-FeS2@C　shows　excellent　cyclic　performance　and　sustains　high　capacities　of　328　mA　h　g(-1)　after　100　cycles　at　0.2　A　g(-1)　and　226　mA　h　g(-1)　after　1000　cycles　at　1　A　g(-1).　Especially,　it　displays　a　superior　rate　capacity　of　200　mA　h　g(-1)　at　20　A　g(-1),　higher　than　that　of　Y-S　FeS2@C　and　most　as-reported　metal　sulfide　anodes　for　PIBs.　The　experimental　analysis　and　theoretical　calculation　illuminate　the　effect　of　Ni-doping　on　decreasing　the　particle　size　of　iron　sulfide　and　enhancing　the　ion/electron　transport　ability,　thus　accounting　for　the　exceptional　rate　capability　of　Y-S　Ni-FeS2@C　composite.