Artificial photosynthesis is promising to convert solar energy and CO 2 into valuable chemicals, and to alleviate the problems of the greenhouse effect and the climate change crisis. Here, we fabricated a novel photocatalyst by directly growing Bi 2 MoO 6 nanosheets on three-dimensional (3D) N,O-doped carbon (NO-C). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the designed photocatalyst ensured the close contact between Bi 2 MoO 6 and NO-C, and reduced the stacking of the NO-C layers to provide abundant channels for the diffusion of CO 2 , while NO-C can allow for fast electron transfer. The charge transfer in this composite was determined to follow a step-scheme mechanism, which not only facilitates the separation of charge carriers but also retains a strong redox capability. Benefiting from this unique 3D structure and the synergistic effect, BMO/NO-C showed excellent performance in photocatalytic CO 2 reductions. The yields of the best BMO/NO-C catalysts for CH 4 and CO were 9.14 and 14.49 μmol g -1 h -1 , respectively. This work provides new insights into constructing step-scheme photocatalytic systems with the 3D nanostructures.