To provide a method of efficiently sorting size of concrete waste material and efficiently creating an artificial island by utilizing concrete waste material of the sorted size.SOLUTION: A concrete waste material transported by the medium-sized machine ship using a water channel is sorted according to a predetermined size at the port working base, and the area of the coral reef adjacent to the port working base or the reef lake Deposited at least several meters above sea level and several emails wide at least a few meters above sea level in order from the large concrete waste material on the coral reef or in the reef lake toward the area getting farther away from the area, and the deposition was completed. A cement slurry is poured into the embankment from the surface of the embankment to connect the concrete scraps together, fix the entire embankment, and fill the inside of the embankment to create an artificial island.[Selected figure] Figure 1
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