The research procedure and specification of World Motorcycle Testing Cycle (WMTC) are introduced in this paper. The international and domestic study of WMTC limit is also expounded.

• 摘要对全球统一的摩托车排放则试循环的研究历程、具体规定进行了简要介绍，并说明了国际以及国内对其第二步工作即限值确定的进展情况。