The solid modeling in CAD die casting die system based on characteristic parametrization was developed. The solid models of die casting die parts were established using parametrized and characterized modeling based on the die disassembling technique.The parametrized solid graphics-base is built up based on the temporary model base

sharing model base and parametrized model base. And the parametrized solid assembly figure of die-casting die was established based on the data-structure of defining the assembly relationship among die parts.The technique plays an important role in the CAD system for die casting die

achieving good application to practical production.