The main raw materials of tundish working lining dry material are sintered magnesia, high-purity magnesia and fused magnesia, with phenolic Resin (dry powder) and inorganic salt as binder. During construction, the dry material flows freely from the gap between the mold and the permanent lining, then start the mold to vibrate for a few minutes or use the tamping method to knot, then ignite and bake in the mold to 200~300℃, and keep the temperature for 1.5~2 hours , After cooling and solidifying, a complete, uniform and long service life working lining is formed. The environment-friendly dry material has no peculiar smell, no smoke, and no pollution to the environment during baking.