Generally, reinforced concrete structures are exposed to complex deterioration. It is necessary to investigate the effect of decreasing the strength of reinforced concrete structures subjected to aging more frequently. Therefore, this study aims to analyze the resistance to freezing and thawing during complex deterioration. After the beam specimens were prepared, the freezing and thawing tests were carried out and the strength of the specimens subjected to freezing and thawing decreased as a result of 4 - point bending test.