This paper introduces the three-way emission control technology and the principle of auto exhaust catalytic converter. The main composition of the three-way-catalyst is also reviewed.

介绍汽车尾气三效催化净化技术及净化器的主要工作原理，并对三效催化剂主要成分： 载体、 涂层、 活性催化剂及助剂进行论述。

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Catalytic technique is one of the major way in purification of automotive exhaust gases, and catalytic converters are main devices for control of automotive emission.

催化剂技术是治理汽车排气污染物的重要手段之一，催化转化器是控制汽车尾气排放的主要设备。

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The petrol composition influent emission of the engine markedly. It is especially important to control petrol composition particularly after three way conversion catalyst were installed in modern car.

汽油成分对排放有较为显著的影响，特别是在现代汽车普遍安装三元催化器后，控制汽油成分就显得尤其重要了。

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