Abstract: Temperature distribution, microstructure of materials and stress strain are known to change in a complicated manner during mold cooling of semicrystalline thermoplastic polymers due to the coupling effects between them. These complex interaction and the factors which will induce the deformation in the final product, such as temperature variations, cry stallization and frozen in orientation are carefully discussed in the first part of this paper. The cons titutive relations of the thermoelastic plastic bod...