Ferrite circulators are key components in the high-power microwave systems for the satellite payload application. Multipactor, which is prone to occur in the high-power vacuum system, is still a bottleneck problem for the on-orbit reliable system operation. The physical evolution model of multipactor in ferromagnetic components is proposed based on the secondary electron emission (SEE) properties. Using the model, the evolution laws of the initial electrons and multipacting electrons in practical components with micro-pore arrays are revealed. Furthermore, a novel anti-multipactor design method is proposed through controlling the surface SEE of the ferromagnetic material. A group of S-band circulators were designed and fabricated for the validation of the theory and design method. Calculation results and measurement data demonstrate that multipactor discharge has been suppressed successfully through lowering the surface SEE on the ferrite plates. Multipactor threshold power of the traditional circulator has been improved from 380 W to more than 3400 W using the optimized micro-pore structures, and the suppression efficiency is increased by more than 900%.