In order to improve water-cooling efficiency for massive concrete, to achieve precise control and transparent management, and to prevent and control concrete cracks, an intelligent water-cooling control system was developed. After three years of field trials of practical engineering and applicability research, key technology for stable and reliable operation under complex conditions in mass concrete construction of hydropower projects was created, and eventually the system was applied to the highest hyperbolic arch dam in the world, the Jinping-I Arm Dam. The results show that the system can realize standardization, refinement, and intelligentization of temperature control during the construction period of mass concrete, and greatly improve the efficiency of temperature control of mass concrete.