Gasoline particulate filter (GPF) is considered a good solution to meet increasingly stringent PN regulations for both gasoline direct injection (GDI) and multi-port fuel injection (MPI) engines. Usually GDI engines emit more particulate matter (PM) and particle number (PN). In recent years, GDI engines have gained significant market penetration in automobile industry, for better fuel economy and drivability. In this study, an accelerated ash loading method was tested through doping lubricating oil into fuel on a GDI engine. Emission tests were performed at different ash loads, with different driving cycles and GPF combinations. Results showed that GPF could significantly reduce particle emissions to meet China 6 regulation. With further ash loading, filtration efficiency is over 99%, and impact on fuel consumption and backpressure is found to be limited, even with ash load up to 50g/l.