Abstract: The third roller compaction concrete cofferdam of the Three Gorge Project (the 3rd RCC) burdened the initial stage 3 years navigation and power generation after it was builded.In order to keep the pace of construction, the 3rd RCC had to be removed before flood season in 2006. A series of researches and tests were put into effect to ensure the security of the dam. The last designate plan (the topple ove plan of blasting construction) was carried out smoothly in June 6, 2006. The monitor data shew that the plan met the design idea very well. It was a grand blasting of unprecedented size: The charge is 192t, the section of blasting is 959. Its success promoted our control blasting greatly.

Key words: Three Gorge Project, roller compaction concrete, removing