Abstract: To address the issue of catalyzed diesel particulate filter（CDPF） failure caused by abnormal regeneration leading to overheating during operation, a simple burner test bench was established to conduct drop to idle（DTI） regeneration tests on CDPF. With same soot load, the DTI timing was controlled to investigate the temperature regulation characteristics during the active regeneration process of CDPF under different regeneration durations. The results show that if DTI occurs toolate, the interior of in the CDPF fails to reach the ideal regeneration temperature, leading to lower peak regeneration temperature inside the carrier. Conversely, too late DTI timing causes significant soot consumption inside the CDPF. Although the internal temperature of the CDPF is higher when the idle speed was lowered, the peak temperature remains low.