exo-Tetrahydrodicyclopentadiene can serve as both the propellant and coolant in hypersonic vehicles. However, its applications are restricted by the poor properties of ignition and combustion to some extent. Fuel additives such as appropriate alcohols have the ability to overcome these deficits. Research on thermophysical properties of the mixtures composed of exo-tetrahydrodicyclopentadiene and fuel additives can provide important information for the research of fuel additives. In this work, densities and viscosities of the ternary system of exo-tetrahydrodicyclopentadiene (1) + n-decane (2) + iso-butanol (3) and three corresponding binary systems have been measured over the whole composition range in the temperature range from 293.15 to 333.15 K with an interval of 5 K and at pressure p = 0.1 MPa. The values of excess molar volumes (V-m(E)) and viscosity deviations (Delta eta) of three binary systems and the ternary system were calculated and then fitted to the Redlich-Kister equation and four semi-empirical equations, respectively. The variations of V-m(E) and Delta eta were explained from the viewpoints of intermolecular forces and structural effects. Furthermore, the Jouyban-Acree model was used to correlate the values of densities (rho) and viscosities (eta) of the studied mixtures with high accuracy.