China Instrument and Control Society has committed itself to development and application of computer science and technology for a long time, with especially focusing on application of instrument, complex system, modeling and simulation. The internal annual conference of CACIS, organized by its underling institute—application of micro-computer institute, has become an important stage of intercommunion and influence that related specialties of information subject have attended in. The 20^th progress of computer technology and application conference (CACIS·2009) will hold on July 17-22, 2009 at Guangxi University, NanNing, GuangXi, China. Safety Critical technology is an important theme of this conference, which will invite experts from home and abroad to carry through wonderful conference report related to such theme, including the following：

	Nicholas Mc Guire：expert of embedded Linux in Austria, professor of Distributed and Embedded Systems Lab of Lanzhou University Title of report：Floss Software Architecture for Safety Related Systems
	Xu-bang Shen：Academician of Chinese Academy of Sciences, expert of computer, research fellow of China Academy of Space Electronics Technology Title of report：Technical evolvement of computers
	Timothy K. Shih：Doctor, expert of multimedia computing, professor of Taipei University of Education Title of report：Video Forgery
	Zhen Wei：expert of safety control, professor of Engineering Research Center of Safety Critical Industry Measure and Control Technology, Ministry of Education, president of GOCOM Information & Technology Co., LTD. Title of report：Safety critical technology in intelligent scheduling system of industrial railways