The IEEE Conference on Industrial Electronics and Applicationsis is a premier conference, started in 2006 by the IEEE Industrial Electronics (IE) Chapter of Singapore. The purpose of the conference is to create a forum for scientists, engineers and practitioners throughout the world to present the latest techniques in Industrial Electronics. The 4th IEEE Conference on Industrial Electronics and Applications (ICIEA 2009) is organized by the IEEE Industrial Electronics (IE) Chapter of Singapore, Northwestern Polytechnical University(NPU) and IEEE Xi'an section. It will be held in Xi'an, China from 25th to 27th May 2009. Xi'an, the ancient capital city of 13 dynasties known as Chang'an and with more than 3,100 years of history, records the great changes of the Chinese nation just like a living history book. Specialists and scholars regard it as an inexhaustible treasure house of literature while heads of state from many countries and people from all over the world turn their eyes to this tourist attraction, trying to broaden their knowledge of Chinese civilization. The Proceedings of ICIEA will be included in the IEEE Xplore database and indexed by Ei Compendex.