Based on finite element virtual bench test, a new method to acquire the reduced load spectrum, which is used to conduct accelerated fatigue bench test of driving axle housing, is brought up in this paper. After static strength analysis, fatigue life prediction, strain history acquisition and time correlated damage analysis, the reduced load spectrum for the accelerated fatigue bench test of a military special vehicle driving axle housing was acquired under the FE simulation circumstance. The bench test result shows that the reduced load spectrum can significantly shorten the test period, while the damage can be preserved as well, which proves the value of the method.