The general construction technology of bed leveling is rails-scraping method.Research on automated bed leveling system underwater by floating intelligent control is blank.This project exploited a combination of theoretical analysis,system design,process test and other means of combining the development of positioning,riprapping，rubble-bedding leveling construction,detecting technology,coming to be the construction method of underwater bed leveling by floating intelligent control.This method has enriched the construction technology of deep water hollow composite breakwater,and will provide an important reference for leveling construction project of underwater bed leveling with small amount of construction on the similar condition.