High performance concrete (Hight Performance Concrete - HPC) is increasingly widely used in construction of buildings in general and bridge constructions in particular due to the advantages of strength, elastic module and high strength, ability High anti-corrosion ability, less affected by outside environment. Because high performance concrete is used as a mixture of concrete with a higher content of cement than ordinary concrete, it generates more heat during cement hydration. The paper presents the method of determining the hydrothermal parameters and calculating the thermal parameters for a specific fly ash HPC mixture. The hydrothermal parameters, as well as the rate of heat generation and adiabatic temperature rise, were compared with conventional concrete. The development of HPC's hydrothermal parameter set is necessary to use for heat control, to predict the possibility of cracking and durability of HPC structures.