Proceedings of the Sixth China-Japan-US Trilateral Symposium on Lifeline Earthquake Engineering, held in Chengdu, China, May 28 - June 1, 2013. Sponsored by Beijing University of Technology, China; Kanazawa University, Japan; University of Southern California, US; Southwest Jiaotong University, China; Shanghai Institute of Disaster Prevention and Relief, China; Research Institute of Lifeline Engineering, Inc., Japan; Lifeline Network, Kansai (LiNK), Japan; Technical Council on Lifeline Earthquake Engineering (TCLEE) of the American Society of Civil Engineers, US; International Association of Chinese Geotechnical Engineers (IACGE), US; and the National Natural Science Foundation of China. This collection contains 86 peer-reviewed papers covering recent developments in lifeline earthquake engineering involving water, wastewater, gas and liquid fuels, electrical power, telecommunications, and transportation systems. Topics include: seismicity, ground motions, and site effects; seismic performance, modeling, evaluation, and design of infrastructure systems; seismic reliability and post-earthquake serviceability; recovery and resilience of lifeline systems; hospitals; lifeline interactions; fire following earthquake; tunnels and underground structures; geotechnical and structural earthquake behavior related to lifelines; and seismic testing and analysis for lifelines. These papers will be of use to practitioners, researchers, and students interested in international approaches to seismic resilience.