In casting production, the quality of castings must be controlled and inspected. First of all, we must formulate process rules and technical conditions from raw materials and auxiliary materials to the control and inspection of each specific product. Each process is strictly controlled and inspected in accordance with the process rules and technical conditions. Finally, the quality of the finished castings is inspected. To be equipped with reasonable testing methods and appropriate testing personnel. Generally, for the appearance quality of castings, comparison samples can be used to judge the surface roughness of castings; fine cracks on the surface can be inspected by coloring method and magnetic particle method. The internal quality of castings can be inspected and judged by audio frequency, ultrasound, eddy current, X-ray and γ-ray methods.