Silicon, as a promising semiconductor for fabricating photocathode toward photoelectrochemical hydro- gen evolution reaction (PEC-HER), should be improved in light harvesting ability and catalytic kinetics to obtain high PEC performance. Herein, a novel amorphous Nickel Oxysulfide (NiSxOy ) film is effectively integrated with a Ti protected n + p-Si micropyramid photocathode by the electrodeposition method. The fabricated n + p-Si/Ti/NiSxOy photocathode exhibits excellent PEC-HER performance with an onset poten- tial of 0.5 V (at J = ? 0.1 mA/cm 2 ), a photocurrent density of ? 26 mA/cm 2 at 0 V vs. RHE, and long term stability of six hours in alkaline solution (pH ≈ 14). The synergy of unique n + p-Si micropyramid ar- chitectures (omnidirectional broadband light harvesting ability), novel amorphous NiSxOy catalyst (high HER electrocatalytic activity and good optical transparency) results in the high performance of n+p-Si/Ti/NiSxOy . This work offers a novel strategy for effectively integrating electrocatalysts with semicon- ductor to design efficient photoelectrode toward PEC water splitting.