During the actual casting process

the heat resistance exists at the interface of casting/mold because of air gap or coatings. Boundary conditions at the interface are changed with temperatures to result in complex heat transfer

which influences the solidification and cooling rate remarkably. Interfacial heat transfer coefficient （IHTC）is a key parameter used to characterize the heat resistance between the castings and the mold. During the numerical simulation of solidification

the IHTC is an important boundary condition. A new method was presented to determine the equivalent IHTC at the castings/mold interface during solidification based on deducting the solvent. A simple shaped part was used as benchmark. Different constants of IHTC were used to simulate the temperature curves

which were compared with the actual temperature curves

when the former is nearly to the later

then the coefficient was regarded as the equivalent IHTC at the castings/mold interface. The blade with different thickness was used to conduct verification experiment. The results reveal that the method is simple

convenient and feasible

exhibiting a wide engineering application prospect.