The original fatigue load spectrum of aircraft structure contains extremely rare high loads. These high loads may cause the overloading effect of crack initiation， resulting in potentially dangerous test results. Therefore， in the verification tests， the high loads in the spectrum need to be clipped. Based on the statistical distribution law of aircraft structural load spectra and the fatigue performance of materials， the probabilistic theory and implementation method of high-load clipping of load spectra are proposed， which ensures that the test results under the corresponding truncated spectrum are both authentic and conservative. Aluminum alloy center-hole plate specimens are designed， simulated service flight-by-flight loading spectra are compiled， and fatigue verification tests are conducted under the original basement load spectrum and the high-load clipping load spectrum. The test results show that the high-load clipping method proposed in this paper is reasonable， which can provide an effective reference for the compilation of fatigue test verification load spectra of aircraft structures.