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By SIMPLE method and Van-Leer scheme, a program on numerical simulation for 3D mold filling has been developed. Thefluid flow field of gas and liquid is calculated in couples by a single phase N-S equation using SIMPLE method, and free surface controlequation is handled by Van-Leer scheme. Then it is verified by an anti-gravity mold filling of thin wall plate. In order to demonstrateits ability to simulate 3D casting, an anti-gravity mould filling of a cube is computed by the program.