In this study, we assume the case of poor curing in winter, and the effect of the initial low degree on the depth of early frost damage and trying to judge the depth of the early frost damage It is a purpose. In other words, when suffering damage by early frost damage, a difference in absorption occurs, but in the process of drying it is trying to analyze whether it is possible to visually distinguish the difference of all early frost damage parts.The results are summarized as follows.(1) The lower the initial curing degree, the more the degree of the upper part of the concrete was drastically reduced, and it was sensitive to the degree. Also, there was a time when the degree of concrete was recovered by freezing regimen.(2) In the case of damage by early frost damage, it was found that the lower the initial degree of curing, the more the freezing expansion was added, and the absorption rate was added by the relaxation of the concrete structure. It showed that the damage depth of the early frost damage is added, but this was analyzed that the low curing degree of the concrete greatly affected the depth of the early frost damage.(3) Due to the swelling of the concrete structure due to the expansion due to the freezing during the drying process of the core test, the drying time was lengthened. Also, at around 40 minutes drying time, the difference between all early frost damage parts was greatly observed, confirming that it can be quantified by measuring the brightness using this spectral colorimeter did.In addition, early frost damage was added when mixing cement was used more than in the case of 100% OPC as the initial lower degree of curing. Moreover, we could grasp the depth of early frost damage by the difference in lightness with the time excess between the suspected part of the damage and the healthy part using the spectral colorimeter. In particular, in the case of dry examination after flooding, it was found that the difference in brightness between the suspected part of the damage and the healthy part is clear.