“交—直—交”型电力机车具备其它类型机车无法比拟的优点。本文从该类机车原理入手,对交流传动电力机车的“绿色”优势和我国机车交流传动事业的发展状况进行了论述,充分说明我国已具备使用交流传动电力机车提高我国“绿色”铁路运输的能力。随着大量交流电力机车的下线和投入使用,必将促进我国的“绿色”铁路运输关键装备。 “AC - DC - AC ” electric locomotive with other types of locomotives unmatched advantages. This paper starts with the principle of locomotives, and discusses the advantages of “green ” and the development of locomotive AC drives in China. It fully shows that China already has the capability of using AC drive locomotives to improve China “Green Railway transport capacity. With a large number of AC electric locomotives off the assembly line and put into use, it will surely promote China’s ”green" railway transportation key equipment.