The study identified the efficiency of the new technology, No.618 and No.660, which are the crack control engineering of the mat concrete, developed by the research team, by applying both in the field at the same time. The efficiency is attained by analysing the overall mat concrete properties and the hydration heat temperature hysteretic characteristics First of all, as the fresh concrete characteristics, slump, air content, chloride content and concrete temperature satisfied all the target values. The compressive strength of the hardened concrete at the age of 7days and 28days met the nominal strength required by the orderers. From the measurement of the temperature hysteretic characteristics, the temperature gap between the center and the surface of A and B sector, which can be caused by the casting time difference at the initial time, was minimal. The maximum temperature of the middle part of A sector was 59.6℃ and 55.6℃ for the surface. In the B sector, 54.6℃ and 48.9℃ respectively for the middle part and the surface. So there were no cracks caused by hydration heat in the sector A and B. Both, A sector and B sector generate the hydration heat in the upper and lower part of the concrete at the age of 8~9 hours. But the cracks did not occur because Double Bubble Sheets insulated the surface and reduced the temperature gap between the middle part and the surface. Finally the study confirmed that for the hydration heat crack control of the mat concrete, new technology No.618 and No.660 are recommended to be used at the same time.