A combined theoretical and experimental program was carried out to study the effect of different solidification pressures on the heat transfer coefficient at the metal-mould interface during counter-gravity casting of A357 alloy. The interface heat transfer coefficient ( IHTC) at different temperatures and pressures could be calculated by substituting the dates of the experimental temperatures into the heat transfer coefficient equation, and the variable curves of the IHTC at the different temperatures had been obtained. The results showed that, the IHTC increased with raising the solidification pressure and it made a better contact between the metal and mould. IHTC is decreased with the temperature of interface of metal-mould falling. However, when the temperature of interface of metal-mould is less than a certain value, the IHTC is tend to a stable one.