Abstract: A Hopkinson pressure bar device was utilized in high overloading tests for initiators as a high-g-value acceleration generator. And a finite element model was created to simulate the operation process of producing acceleration pulses. The effects of the bullets and the pulse shapers on the loading pulses were investigated by considering the shapes of the bullets as well as the materials, diameters and thicknesses of the pulse shapers, respectively. To realize the purpose of effectively controlling and improving the loading environment in impact tests for initiators, the required acceleration pulses were obtained. So the investigated results can provide a basis for experimental designations and tests to check the reliability of initiators in impact environments.