A numerical model of the direct injection gasoline engine particulate filter(GPF) was established by using the numerical simulation software AVL-FIRE

and the model was verified based on relevant experimental data. The effects of exhaust parameters including exhaust oxygen concentration， NO concentration and exhaust temperature on the GPF regeneration equilibrium state were analyzed by calculating the pressure drop and carbon load of the GPF under different exhaust parameters. The results show that the higher oxygen concentration is beneficial for reaching the regeneration equilibrium state. With the exhaust temperature of 800K

GPF couldn’t reach the regeneration equilibrium when the oxygen mass concentration is 2%

and GPF can reach the regeneration equilibrium state when the oxygen mass concentration increases from 2% to 7%. NO mass concentration has a great impact on the pressure drop of GPF. With the exhaust temperature of 800K and the oxygen mass concentration of 7%

the pressure drop in the regeneration equilibrium state decreases by 11.6% as the exhaust NO mass concentration increases from 0 to 0.2%. The higher temperature is better for reaching the regeneration equilibrium state for GPF. At the oxygen mass concentration of 2%

GPF can reach the regeneration equilibrium state when the exhaust temperature increases from 800K to 1000K.