In this experiment, the strength development in structure specimens of high-strength concrete using the blast furnace slag fine aggregate was studied. As results, it is less than specimens of standard curing that the proportion of mixing the blast-furnace slag fine aggregate influences the deterioration of strength about structure specimens. In period of curing, the temperature of concrete using blast furnace slag fine aggregate is slightly higher than concrete using sand in structure specimens. Strength correction value (S value) of the concrete using the blast furnace slag fine aggregate is smaller than the concrete using river sand in structure specimens.