Abstract: Alkaline water electrolysis (AWE) technology is currently a mainstream method for producing hydrogen from renewable energy sources, and spherical concave-convex (SCC) shaped bipolar plate are widely used in alkaline electrolyzers. In this paper, a multi-physical simulation model of alkaline electrolyzer is established using numerical simulation methods. Based on the simulation model, we propose to study the effects of three arrangements of SCC, namely, alternate arrangements, cross arrangements and sequential arrangements, and of the distance of SCC on the distribution of physical fields and hydrogen production performance, for proposing an optimization strategy. The study found that the SCC structure can significantly improve the electrolysis reaction strength and gas component distribution on the electrode, but this structure also brings problems of bubble formation and temperature accumulation. When the operating voltage is 1.8 V and the temperature is 70 ℃, the polarization current density of the cross arrangement of SCC with a spacing of 15 mm can be more than 2000 A/m2, the maximum temperature rise can be lowered by nearly 2 ℃ compared with other structures, and it has good performance in terms of temperature uniformity, gas fraction, and flow field uniformity.