Photonic Doppler velocimetry(PDV) is usually based on all-fiber mode, which is easy to operate and has become an important diagnostic technology for ultra-high pressure dynamic material properties experiments. The range and accuracy of velocity measurement are related to photoelectric converter and data acquisition instruments. When the optical signal reflected by the target returns to the photoelectric converter, the frequency of laser intensity is changed by Doppler effect. The PTS facility is an important platform for dynamic material properties experiments. The peak current is 5-8 MA and the 0-100% rise time is 300-750 ns. During the loading process, there is strong electromagnetic interference in the target chamber, whose frequency are 10-300 MHz. When the interference is coupled into the return optical signal, the velocity data will be covered. Using PTFE insulating film and conductive aluminium film coated velocity probe can suppress the interference of strong electromagnetic interference signal to optical signal, and greatly improve the validity of velocity measurement data.