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Recently, sea-sand containing high levels of chloride is being used on reinforced concrete structure constructions due to the exhaustion of river-sand and environmental problems, which affects directly corrosion of rebar in the RC structures. In this paper, characteristics of corroded rebar before and after casting were studied. Test results show that bond strength of rebar corroded after casting was decreased with increasement of corrosion level more rapidly than that of rebar corroded before casting.Primary results of this study are as next. In the case of corrosion after concrete casting, bond strength is not given the decrease as compared with the standard until about 1% real mass loss using D13 and D19 reinforcements. The other side, bond strength is decreased suddenly beyond the limits of the range.