A dual diesel particulate filter system was developed by using the heat resistant filter bag as filtering element. The intake fresh air of the diesel engine was used to blow off the deposited particulate matters (PM) and send them back to the cylinder. The blow-off PM in the filter was assisted by high-pressure air scanning reverse flow. The PM burning in the cylinder realized the regeneration of the filter. The verification tests were performed in the dynamometer test bed with a single-cylinder diesel engine. Under the steady operating condition, and the filtering time span was equaled to the regeneration time span, the resistance of intake and exhaust of bag-type-filter rehabilitated thoroughly. It showed that the intake process of the intake fresh air and high-pressure air could blow off the deposited PM on the outer surface of the bag, ensure the successful regeneration of the bag-type-filter with filtering efficiency of 82%～94%.