In order to test the operation state of travelling wave fault location equipment and improve the inspection accuracy, a method of inspection for double-ended fault location based on historical fault waveforms is proposed. This method uses the historical fault waveforms which were recorded by the travelling wave fault location equipments as the testing waveforms, loads them on HF travelling wave source, and inputs the testing waveforms into both sides of the traveling wave fault location equipment by the GPS synchronous devices. The master station of the fault location system calculates the ranging results, and compares them with the historical fault distance of testing waveforms. The site test results verify the effectiveness and practicality of this method. This method can accurately inspect the operation state of the traveling wave fault location equipment, thus protects the operation transmission lines operating safely and steadily.