Three specifications of the three-way catalysts(TWC)were prepared using an excellent Ceria-Zirconia solid solutions as oxygen storage materials to match the three vehicles made in China reaching the Eu III standard.The catalysts activities before or after aging for 100 hours were researched on the engine bench test system.The three vehicles matched with the fresh catalysts and the aging catalysts reached the Eu III standard for the Type 1 test and 80 000 kilometers durability.