As the core component of the metal filtration system, foam ceramic filter is the key link of liquid metal purification in the two mainstream processes of aluminum melting casting and precision casting. The rationality of its type selection directly determines the purity of liquid metal, casting quality and production efficiency. There are significant differences between aluminum melting casting and precision casting processes in molten metal temperature, impurity characteristics, precision requirements, etc. If the foam ceramic filter is not properly selected, it will not only fail to play a purification role, but also easily lead to filter cracking, blocking and other failures, increasing enterprise production costs and casting scrap rate. With the transformation of casting industry to precision and efficiency, how to correctly select the foam ceramic filter suitable for the two processes has become an important issue for enterprises to standardize production, improve quality and efficiency, and enhance core competitiveness.