A new rotary unit-block diesel particulate filter (DPF) was developed. There were several unit blocks with fan-shaped cross-section in the filter. These blocks were arranged in a circle and axial rotation during regeneration with microwave. The mechanism of the rotary unit-block DPF on the filtration and regeneration were analyzed and the filtration efficiency, the pressure drop characteristic were compared with the traditional overall body filter. The experimental study shows that rotary unit-block DPF is a better solution to continuous regeneration and has better performance. It is able to break the power restriction when used for vehicle.