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Many efforts have been made to apply the diesel exhaust particulate after-treatment system in practical use during the past ten years. In this paper, a diesel exhaust particulate after-treatment system with microwave energy as its external regeneration energy source is described, and the microwave regeneration characteristics of the diesel exhaust particulate after-treatment system developed are studied. The experimental results show that the regeneration efficiency can reach up to 80% with a wide regeneration window and a suitable regeneration duration. The effect of air supply on filter regeneration is also observed. It is proven that the microwave regeneration technique employed in the system is simple, effective and reliable.