Computational methods have been playing crucial roles in diverse fields such as mechanical, civil, electrical and electronic engineering. The Japan-China Symposium on Boundary Element Methods (1987, 1988, 1990, 1991, 1993, 1994, 1996, 1998) held in Japan and China, First Pan-Pacific Conference on Computational Engineering (PCCE93, 1993) in Seoul Korea, and the Asia-Pacific International Conference in Computational Methods in Engineering (2003 in Sapporo Japan, 2006 in Hefei China) have made substantial contribution on the computational methods. The Third Asia-Pacific International Conference in Computational Methods in Engineering 2009 (ICOME2009) is the continuation of the Asia-Pacific International Conference in Computational Methods in Engineering held in in Hefei, China.