The production of SiC reduction crucible adopts the method of reaction sintering, using silicon carbide as aggregate, adding suitable additives, selecting reasonable particle-grade ingredients, mixing system and molding process, and drying the green body in a special kiln oxidizing atmosphere. (1350-1450℃) fired. With the aid of the ceramic phase sintered by the additive and the silica film formed by the oxidation of the contact surface of the SiC particles, the SiC particles are tightly bound together to form a dense ceramic block and obtain high strength. In order to obtain good product performance, the purity of the selected SiC raw material should be above 97%. For the SiC reduction crucible made by this method, reasonable particle-grade ingredients have a great influence on the strength of the product. The selection of square-shaped particles is not only a prerequisite for the close packing of particles, but also shows the uniformity of performance on the whole of the material. It is not easy to cause damage locally. On the contrary, it will affect the performance of the product. Impurities in the raw materials have a great influence on the performance of the product, because impurities such as iron oxide will form some solid solution phases with low melting point, which is unfavorable to the performance of the product. Therefore, in production, the amount of impurities such as iron oxide should be controlled to ensure the good performance of the product.