Based on a new regeneration model with microwave heating for rotary unit-block diesel particulate filter, the filter body wall temperature along the radial distribution and structure parameters of the filter unit on the influence of microwave heating during the regeneration process were obtained by numerical simulation. The results show that the wall temperature gradually increases from the outer surface to the inward surface and the peak temperature emerges in the inward surface; the smaller central angle will shorten the regeneration time; the smaller length and the smaller thickness can shorten the regeneration time. The results provide important theoretical guidance for the optimization of the regeneration process.