Chalcogenide materials are emerging as promising anode materials for sodium-ion batteries because of their reasonable capacity, which stems from two consecutive conversion and de/alloy reactions. Herein, we intro- duce the layer-structured Bi 2 S 3 that shows long-term cyclability for sodium storage. Since deep sodiation in- duces the de/alloy reaction accompanied by a large volume change, we intentionally limit the reaction to the conversion process, resulting in long-term stable cyclability followed by a two-step conversion reaction: Bi 2 S 3 + 3Na + + 3e − →NaBiS 2 + Bi 0 + Na 2 S followed by NaBiS 2 + 3Na + + 3e − →Bi 0 + 2Na 2 S, which was con- firmed by operando X-ray diffraction, X-ray photoelectron spectroscopy and time-of-flight secondary-ion mass spectroscopy. During the electrochemical reaction, the presence of reduced graphene oxide (rGO) anchored with Bi 2 S 3 assists to improve the charge transfer and buffers the electrode integrity, resulting in enhanced electrode performance of the Bi 2 S 3 /rGO composite compared with that of bare Bi 2 S 3 . The feasibility of using the Bi 2 S 3 /rGO composite is further confirmed in a full cell by pairing it with a Na 0.67 [Ni 0.1 Fe 0.1 Mn 0.8 ]O 2 cathode, resulting in reasonable capacity retention of ~74 % of the initial capacity for 300 cycles