Abstract: The output signals of measuring coil for eddy current testing is rather complicated, but is essential for detection accuracy and reliability. Several new techniques of eddy current signal analysis and processing, including wavelet denoising, neural network, electromagnetic simulation, DSP technique and network data processing system were discussed. The development trend in future was presented by studying the application status and development potential of these new methods, that is the realization of auto detection by integrated usage of these techques combined with expert system.