This report shows the test result to be evaluated the frequency characteristic of fiber Bragg gratings (FBG) sensors using a single Hopkinson's bar. The Hopkinson's bar is a thin stainless bar of which the diameter is 30mm and the length is 2m. The elastic pulse wave, which propagates along the bar, was measured as strain using two FBG sensors and two types' semi-conductor strain gages. The measured strains by the sensors were good match in both time and frequency domain. The result shows that FBG sensors are available to measure very fast dynamic strain up to 100 kHz. The measurement system for FBG sensors would be effective to monitor and to evaluate fatal damages of structures that run at high velocity like aircrafts and launch vehicles and are equipped with sub-systems, which are operating at fast speed like jet engines.