The test result of mat concrete applying both hydration heat difference and insulation curing method on new construction of Cheongju university educational building are summarized as following. Both fresh concrete and compressive strength properties were satisfied in aimed value. Setting time of concrete incorporating 15% of fly ash(FA) retarded 1.2 hour than control concrete. Temperature history of mass concrete indicated that the highest temperature of center was exhibited at 12.6℃ after 51 hours while the highest temperature of upper section was 10.6℃ after 46 hours. Temperature Difference between center and surface was managed at less than 6℃ during whole curing period. In addition the temperature of upper section secured more than 3.3℃ while the temperature of outside was indicated at less than -10℃. Maturity by parts of construction secured more than 30º DD higher than outside at 3 days. The more number of times, applying insulation curing method by double sheets, increased, the higher economic effect was secured. Overall it was clear that applying both double bubble sheets and hydration heat difference method on this new construction can resist hydration heat crack, early frost demage and strength decrease. It also significantly contributed quality improvement of cold weather concreting.