In the past study on steel-fiber concrete's (SFRC's) crack resisting capability, its mechanical performance was always considered to be more than its heating property. In this paper, the pier-wall models respectively built with steel-fiber concrete and ordinary concrete were tested for revealing their early bebaviors of thermal strain and thermal stress caused by adiabatic heating. By means of analyzing the measured data of deformation and temperature inside the structure, the laws of deformation and temperature of the SFRC structure under the influences of early hydration heat and outside temperature were found. Through applying thermodynamics theory, it is concluded that the heat conductivity of steel-fiber concrete is superior to normal one. This behavior will be helpful to decrease temperature gradient and to lessen surface thermal stress of concrete structure so as to prevent cracking of a structure. Also the problems occurring in the test are discussed.