Abstract: Received signal of the electromagnetic acoustic transducer (EMAT) is very weak resulted from EMAT's poor transduction efficiency. To improve the signal quality, the EMAT received signals were proceeded with three methods, which were the frequency selecting technique based on resonance theory, the lock-in amplifying technique based on cross-correlation theory and the averaging technique. Experiments proved that both frequency selecting amplifier and lock-in amplifier were able to separate the EMAT received signal from a strong noise background, while the averaging technique could effectively improve the signal to noise ratio of the received signal. At last, waveforms of the received signal were given, and the strengths and weaknesses of these three methods were analyzed.