In the concrete structure of the concrete material is installed on the top of the breakwater, Half wave portion having a half wave surface formed toward the outer port side; And a support portion integrally formed with the half wave portion on the inner side of the half wave portion, wherein the half wave portion has an engraved half wave hole formed by being embedded in the half wave surface. By rotating the incident wave, the wave can be effectively reduced, and the sofa effect can be increased by dissipating the wave energy using the negative half wave hole. In addition, the negative half-wave hole has the effect of recirculation not only on the vertical incident wave but also on the oblique incident wave, so that the effect of reducing the pressure applied to the structure can be expected. In addition, the step of mounting a PC (Pre-Cast) portion having a plurality of grout holes formed to communicate with the outside at the bottom, the interior space is formed, the PC (Pre-Cast) portion of the upper portion is mounted on the upper side of the breakwater ; Grout placing step of fixing the PC (Pre-Cast) to the upper end of the breakwater by placing the grout in the lower side of the PC (Pre-Cast) through the grout hole; And by placing the concrete in the interior space concrete placing step of forming an internal concrete portion; providing a construction method for reducing the wave wave reduction including, it is possible to minimize the sea work period.
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