Abstract: During heating to certain temperature region, kyanite can transform to mullite, which possess good properties at high temperature, and free SiO₂ formed. As temperature increases, the kyanite expands and its volume wight decrease. At room temperature, clay is plastic, but it can contract and transform to refractory at high temperature. The plastic refractory materials made from kyanite, clay, some additives and other compounds. It possess following propeties. plasticity at room temperature, slight exponsion at high temperature, resistance to thermal shocks, high compressive strenght and tensile strenght.