The reach Reef Blasting engineering of Tongluo gorge to Louxi river in Three Gorge, will be implemented. Control blasting technique is applied to underwater demolition theatrically; the method and properties of blasting are proposed by the analysis and comparison of blasting vibration test. Directing at the underwater demolition under the complicated environment in the neighborhood of urban area, this paper expounds control blasting technique used in the underwater demolition which decreases the damage to important protection caused by blasting. Therefore, it contributes the theoretical methods to the similar projects.