Abstract: The sheet explosive loading technology is the main method to evaluate the dynamic response of the space structure under the X-ray radiation in laboratory. In order to realize the explosive loading with ultra-low specific impulse for structural examination of new space vehicles, the sheet explosive using PETN as the main explosive and polymer rubber as the binder has been developed. The mass fraction of PETN is 90% ~ 92%, the thickness range is 0.15~0.20 mm, the density range is 1.63~1.68 g/cm3 and the explosive velocity range is 7.44~7.71 km/s. In order to verify the high-impact initiation sensitivity of the sheet explosive, three rounds of verification experiments were designed based on the blast marketing method. In the experiment, the sheet explosive was directly applied to the effect plate or a certain air gap was reserved between the sheet explosive and the effect plate. By observing the explosive marks formed after the explosion on the effect plate, it is judged whether the explosive is detonated. The experimental results show that: the sheet explosive with thickness of 0.15~0.50 mm can be reliably detonated by the mild detonating fuse with a charge line density of 0.2g/m,