Hydrogen fuel cell propulsion system shows significant advantages when it is utilized for zero-emission heavy-duty commercial vehicles which can carry heavy payload for longer distances with high uptimes. Hyzon Motors develops and manufactures the hydrogen fuel cell propulsion system, including in-house membrane electrode assemblies (MEAs), for commercial vehicles. We offer our products to provide our customers with the benefit of total cost of ownership (TCO). Durability is one of the most important attributes for TCO benefit. In this talk, our technical approaches in the materials and control strategy to improve fuel cell system durability and rigorous system engineering process will be discussed.