This paper presents a numerical method for investigating complex heat transfer process of typical hot-cast anchorage used in cable-supported bridges under fire exposure conditions. Dependent on initial temperature, boundary conditions, continuity of interface, heat conduction and cavity radiation, an approach for comprehensive heat transfer analysis of hot-cast anchorage was proposed. Thereafter, a validated refined numerical model, incorporating heat radiation within back-end cavity and heat conduction of air filled in cavity, was developed to evaluate thermal response of hot-cast anchorage throughout entire fire exposure duration. Results from numerical analysis clearly shows that a high temperature occurs at rear-end and heat accumulation takes place at corners of anchor ring.