Abstract: To address the stringent requirements of China Ⅵ emission regulations which incorporate real driving emissions （RDE） testing and include high-altitude conditions in compliance assessments, the differences in regeneration temperature characteristics between diesel particulate filters （DPF） in plateau environments and lowland regions were studied. A one-dimensional coupled simulation model of the diesel oxidation catalyst （DOC） and DPF using GT-Power was developed. The influences of target regeneration temperatures, initial carbon loading, exhaust mass flow rates, and oxygen content on the DPF substrate temperature distributions and peak temperatures under different atmospheric pressures （100 kPa, 80 kPa, 60 kPa） were analyzed. Results show that as the altitude increases, the overall DPF substrate temperature rises, accompanied by higher internal peak temperatures. At 80 kPa and 60 kPa, peak temperatures increased by 4.0% and 9.4%, respectively, compared to that at 100 kPa. Increased carbon loading combined with altitude elevation enhances reaction exothermicity, further elevating internal DPF temperatures—with the maximum increase of 9.4% at 60 kPa compared to that at 80 kPa. Increased exhaust mass flow enhanced heat dissipation, causing a negative correlation in peak internal temperatures, with a maximum decrease of 1.9% at 80 kPa compared to that at 100 kPa. A high-oxygen environment accelerated the rapid concentrated oxidation of carbon soot, intensifying exothermic reactions, which resulted in a maximum increase of 10.3% in peak internal carrier temperature at 60 kPa compared to that at 80 kPa condition.