A Co9S8/MoS2 composite has been prepared successfully via a one-step hydrothermal method. This 3D flower-like Co9S8/MoS2 electrocatalyst insitu grown on Ti mesh.Serving as an oxygen evolution reaction(OER) electrode, the obtained Co9S8/MoS2@TM delivers a current density of 10 mA/cm2 at low overpotentials of 316mV in alkaline media and small Tafel slope values of 88.5 mV/dec.The superior electrochemical properties of the Co9S8/MoS2@TM are attributed to 3d nanoarray,which both enlarging the electrochemical surface area(ECSA),and exposing abundant active sites,that ensures easy diffusion of electrolyte and fast release of gas products. Moreover,Co9S8/MoS2@TM exhibited high activity and 20h stability for OER .