The dynamic fracture behavior of a functionally graded coating–substrate system with an internal crackperpendicular to theinterface is studied under an in-plane impact load. The structure consists of a functionally graded coating and a semi-infinite homogeneoussubstrate. The crackis located in the functionally graded coating. The mixed boundary value problem is formulatedanalytically by use of integral transform techniques and singular integral equation. The influences of material constants and thegeometry parameters on the dynamic stress intensity factors (SIFs) are studied.