Abstract: Based on the application of composite high frequency probes to identify metal materials, the factors which may affect the identification results have been studied, such as pressure on the probe, frequency of probe, pulse voltage and repetition rate ,coupling of material. Under the same conditions, the properties of the composite probe and the piezoelectric probe have been compared.The results show that a stable scattering echo signal can be obtained while the pressure applied to a probe is 2.5 N. The scattering signal will be clearer when the frequency become higher within a certain range.The magnitude of echo signal is related to the pulse voltage, gain and coupling conditions, when the average number of sampling reaches 2 000 times and the scattering signal tends to be stable.The pulse repetition can be adjusted within a certain scope, and it will not affect the identification effect. It is found that the composite probe has certain advantages in identifying similar property metallic materials with the same parameters.