Honeycomb ceramic filters are designed for filtration of cast iron and nonferrous alloy. It has the characteristics: larger specific surface, high mechanical strength, and perfect heat-resistance performance. It can make the following result through filter: Purify metal liquid and get ride of non- metal impurity and gas. Make the filling type of the metal liquid steady and reduce the swirl. Simplify the pouring system and improve the producing rate. Reduce the air vent of castings and optimize and thin out metal organization. Improve surface quality of castings and mechanical performance. Reduce the rejection rate of castings, reduce the surplus of processing, raise the life span of the cutter and reduce casting cost.