It’s difficult to directly measure the pressure on the surface of the material in the impact process. The PVDF (Polyvinylidene Fluoride) gauges may help to solve the problem. In this paper, some split Hopkinson pressure bar(SHPB) experiments were carried out with the PVDF Gauges as specimens. And the strain gauges pasted on the bars are used as measurement method. By comparing the results of the strain gauges and the PVDF gauges, it is proved that there are stress concentration when the PVDF gauges were sandwiched directly in the solid interface. Then two methods to eliminate stress concentration are verified by experiments. The first method is adding cushion, such as electrical tape. The second method is using 502 glue, which is evenly coated on the interface.