In order to guarantee the quality and efficiency of a deepwater breakwater’s 1 510 m long crest wall, according to the difficulties that the wave breast wall is of 6.5 meters high, containing 20% stones, and with narrow passages, etc. we carry out a research on the construction technology of the crest wall, and develop the integrated construction technology of gantry mounting and template innovatively. For the technology, we design the bottom crest wall gantry mounting and the top crest wall gantry mounting in view of the template’s installation, riprap technology, as well as the allocation of resources. By the special technology, we realize the quickest construction at that time under the prerequisite of guaranteeing the casting technology of the crest wall.