Artificial neural network technique was applied to calculate the locations of the metal front at time interva ls in the lost foam casting(LFC).Experiments have been conducted to validate the model.The results of simulation and experiments are consis tent,both in filling pattern and sequence.The fluid flow and the temperature distribution during the mold filling process of LFC w ere calculated through the numerical solution of the N -S and energy equations based on the calculate d surface positions and boundary con ditions.The application of the model on the computer simulation of LFC was discussed.