Abstract: White Cast irons that contain amount of massive cementite show poor plasticity and toughness, which limited their wide applications in industry. Four methods of plastic deformation and heat-treatment were adopted in this paper to improve cementite's bad morphology and distribution. An ideal structure of fine cementite particle distributing within the matrix of ferrite was obtained. The refined structure white cast iron is of excellent superpla- sticity at the range from 650 to 350℃, and its room temperature mechanical properties also have a great improvement. This kind of white cast iron can be used as wear-resistant die material.