The interfacial heat transfer coefficient(IHTC)is one of the important boundary conditions for the simulation of the plastic forming of zirconium alloys. In this paper, the contact temperature-time curves between Zr-4 alloy and H13 die steel with glass lubrication and without glass lubrication were measured and the characteristics of the interface heat transfer were analyzed. The corresponding empirical formula between the interfacial heat transfer coefficient and the temperatures of both the Zr-4 alloy and die steel were established. The results show that glass lubricant can reduce the interfacial heat transfer between the Zr-4 alloy and the die steel effectively. When the initial temperatures of the Zr-4 alloy and the die steel are respectively 700℃ and 470℃, the temperature of the zirconium alloy surface tends to be stable at time of about 16.3s and the IHTC is increased from 226W/(m₂.℃) to 2166 W/(m₂.℃) during this time under the condition of glass lubrication, while the temperature of the zirconium alloy surface tends to be stable at time of about 7.7s and the IHTC is increased from 250 W/(m₂.℃) to 2700 W/(m₂.℃) during this time without glass lubrication. The empirical formula of IHTC obtained in this paper has high accuracy that the maximum error between the simulated and experimental results is about 4.7%.