Abstract: When ductile iron castings were detected, the standard of EN 12680-3:2012 Founding-Ultrasonic Examination-Part 3 Spheroidal Graphite Cast Iron Castings was often used. Through in-depth study of this standard, combined with practical experience, the authors aim to introduce the experience of understanding and application of the standard and to emphasize that attention should be paid to the transmission method in several issues, which might offer reference for people working in the same field.