A novel scheme for measurement of high-frequency strain is presented. The strain measurement system is made up of Fiber Bragg Grating(FBG) sensor, high-frequency strain signal source and demodulation part. The high frequency demodulation system of FBG is designed based on unbalanced Mach-Zehnder interferometer. The frequency of strain signal can be controlled by a special experimental setup, which is a kind of modified Split Hopkinson Pressure Bar(SHPB) used widely for testing physical properties of materials. The lasting time of strain is calculated according to the length of an elastic piston. It has the same section with impacted elastic bar. Operating frequency range of the measurement system is studied using vibration signal. Experimental results of vibration and impact are shown and discussed. The system can measure amplitude of dynamic strain in real time. Experiment results demonstrate that the measurement system has good frequency response within 8kHz.