Based on the bench test of a 1.5 L gasoline engine equipped with a catalytic gasoline engine particulate filter (CGPF), the fuel cut-off regeneration characteristics of the next generation with small pore size GPF and the common GPF under different soot loading and temperatures were studied. The results showed that after the fuel was cutoff during the regeneration process, the center temperature of the sample rose exponentially, and as the regeneration time extended, the temperature gradually became flat. The temperature distribution inside the carrier was such that the inlet temperature was low at the axial position, and the temperature near the outlet was high, the radial position showed a trend of high temperature in the middle and low temperature at the edge, and the temperature difference between the edge and the center of the carrier was large. The maximum temperature inside the GPF increased with the increase in soot loading, and the maximum temperature gradient also increased. When the soot loading reached 6 g/L and the fuel cut-off regeneration was conducted at 650 ℃, the maximum and maximum temperature gradient inside the GPF exceeded the tolerance limit of the GPF, and the inside of the carrier was damaged to varying degrees. Therefore, these parameters should be controlled during regeneration.