GB 20890-2007 is a standard in the field of exhaust pollutant emission control of heavy-duty vehicles, which stipulates the durability requirements and test methods of the emission Control system. The standard specifies the working conditions setting, test process, performance evaluation indicators, etc. of the durability test, aiming to inspect the effectiveness of the heavy-duty vehicle emission Control system in long-term use, ensure that it continues to meet pollutant emission limits, help reduce the exhaust pollution of heavy-duty vehicles, and promote the realization of environmental protection goals.