建立了应用有限元法进行复杂铸件凝固数值模拟的数学模型，讨论了铸件／铸型等效边界条件、结晶潜热处理及确定缩孔缩松预测判据临界值的新方法，从而使计算时间和内存节省７０％～９０％，提高了计算和预测精度，模拟预测结果与实际结果基本一致． A mathematical model for the numerical simulation of the solidification of complex castings with finite element method was established. The equivalent boundary conditions of casting and casting, the latent heat treatment of crystal and the new method of determining the critical value of prediction of shrinkage porosity were discussed. As a result, The memory is saved by 70% -90%, which improves the calculation and prediction accuracy. The simulation prediction result is basically the same with the actual result.