Abstract: The temperature distribution of billets in a heating furnace is simulated by Deform software and is verified by the "black box". When the heating time is 70 min the temperature difference between surface and center is about 66℃, but it reduces to 15℃ after 80 min. The core and surface temperatures of wire rods in roiling and cooling are calculated and testified by thermometric indicator, and afterwards, the accurate friction heat, plastic deformation heat and heat transfer coefficient of water cooling are obtained. The wind field of fans is computed by Fluent software and is confirmed by anemometer. A temperature model of the lapping point is built and used to calculate the forced convection, natural and radiation heat transfer coefficients and the latent heat of phase transformation on the air-cooling line, which are validated by thermal imager. All the numerical simulation results agree well with the test data.