Shortcut nitrification/anaerobic ammonium oxidation is a new process devel-oped in recent years, based on which the O-A-O process was formed and applied in treat-ment of coking wastewater. The origin, principle and characteristics of O-A-O process are summarized and some experimental research work and applications of O-A-O process are presented, to provide some reference for further research and practical application of the pro-cess.%短程硝化/厌氧氨氧化是近年来发现的新型生物脱氮工艺，在此基础上形成了O-A-O工艺，并将其应用于焦化废水。综述了O-A-O工艺的由来、原理和特点，列举了O-A-O工艺的实验研究及应用，从而为该工艺的深入研究及其在实际中的应用提供了参考。
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