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Finding easy-to-operate strategy to obtain anode material with well-designed structure and excellent electrochemical performance is necessary to promote the development of the future potassium-ion bat-teries(PIBs).In this work,we synthesized reduced graphene oxide doping flower-like Fe7S8 nanosheets electrode materials using one-step hydrothermal strategy.The rGO@Fe7S8 composite is composed of homogeneous Fe7S8 and reduced graphene oxide thin nanosheets.This unique structure not only pro-motes the penetration of electrolyte and increases the conductive of the pure Fe7S8 electrode materials,but also relieves the volume expansion of K+during charge/discharge process.When applied this inter-esting anode electrode for PIBs,the rGO@Fe7S8 exhibits excellent electrochemical performance.It delivers a high reversible specific capacity of445 mAh g-1 at 50 mA g-1,excellent rate performance(284 mAh g-1 at 500 mA g-1 and 237 mAh g-1 at 1000 mAg-1),and a high cycling stability at 100 mAg-1(maintained 355 mAh g-1 after 300 cycles).