Based on commonly used experimental methods in fracture mechanics, with special consideration of the features of the interface fracture, an experimental method for the interface crack is established in the framework of fracture mechanics. With this method, the critical energy release rate can be obtained through the measurement of the load and the displacement of the specimens, for a given length of a crack. Related experiment data verify the robustness of this method, and the qualified consistency between the set of experimental results and the corresponding ones obtained by this method. Further, with this method, the maximum load capacity of the structure can be predicted according to the impedance energy curve. So, this analytic method is a powerful experimental method for the determination of the strength of the interface crack through the energy release rate with wider applications.