Abstract: Alkaline water electrolysis （AWE） technology is currently a mainstream method for producing hydrogen from renewable energy sources, the structural improvement of the alkaline electrolyzers is of great significance for enhancing the efficiency of renewable energy hydrogen production systems. The spherical concave-convex （SCC） shaped bipolar plates are widely used in alkaline electrolyzers, their distribution and arrangement will affect the internal flow field of the electrolyzers, thereby influencing the overall performance of the alkaline electrolyzers. In order to study the influence of the SCC shaped bipolar plate and optimize its structure, a multi-physical simulation model of alkaline electrolyzer was established by 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 （10, 15, 20 mm） on the distribution of multi-physical fields including the electrolyte flow field, gas components, temperature field, and current density, 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. The concave shape is more conducive to increasing the current density and gas diffusion compared to the convex shape. The structure of cross arrangements is superior to that of the alternate arrangements and sequential arrangements in improving the current density of the electrode plate. When the operating voltage is 1.8 V and the temperature is 70 ℃, the polarization current density of alkaline electrolyzer with the cross arrangement of SCC and a spacing of 15 mm is 2004 A/m², and the maximum temperature rise can be lowered by nearly 2 ℃ compared with other two structures, meanwhile, the structure of cross arrangements has good performance in terms of temperature uniformity, gas fraction, and flow field uniformity.