Abstract: Diesel oil mixed with engine oil was used as fuel of agricultural diesel engine，and high load operation condition was adopted to quickly simulate influence of large amount of engine oil consumption and accelerate aging process caused by ash.A simple and efficient fast aging method of diesel oxidation catalysts（DOC）and diesel particulate filter（DPF）was studied，which shortened durability test and evaluation cycle of DOC and DPF.A control test group was set up，and purification efficiency and degradation rate of DOC and DPF were compared.And internal channels and element composition of DOC and DPF were characterized and analyzed in combination with SEM and energy spectrum analysis.Results showed that this method could accelerate degradation of DOC and DPF，realize rapid aging of DOC and DPF，shorten durability test and evaluation cycle of DOC and DPF，and greatly reduce test cost.