Professor Bai Yun devoted to the civil engineering in China, Singapore, India, Vietnam，Thailand, Angola, UAE and other countries for over thirty years. His experience covers many fields of civil engineering such as elevated expressways, MRT project (tunnels and stations),Water treatment facilities, water tunnels, road tunnels, river and sea bridges, soil improvement, rock Caverns and tunnels, site instrumentation, structural test, pile foundation, etc. As an author and co-author, he published more than 100 papers. He also published more than ten books as an author, co-author and editor member. He was a deputy editor/an editorial board member of four technical magazines.