Abstract: The heat transfer process of a single titanium coil during annealing in vacuum furnace was analyzed, and the equivalent radial thermal conductivity was determined by solving the inverse problem of heat conduction. The temperature field of the titanium coil during annealing was simulated using finite element software Ansys, and the real temperature was measured by experiment. The results show that at the beginning of the annealing process, there was a considerable temperature difference between the outer surface and the core, and the greatest deviation was 310 ℃. The temperature difference in the titanium coil was decreased by stage heating and fan forced argon cycle. After annealing for 30 h, the temperature of the titanium coil was stabiluzed at 700 ℃, and the temperature difference was only 6 ℃. The simulated temperature agreed well with the experimental data, proving that the numerical model is reasonable.