Abstract: This paper studied the eddy current inspection for wear indications within structural supports of nuclear power plant steam generator tubes and discussed the data analysis method of two different kinds of wear mechanisms. Meanwhile, We measured or calculated the depth, length, location and volume loss of wear indication through eddy current data analysis method and model computation. Three different depth of wear indication were studied using CIVA simulation platform. It was found that eddy current signals wound give a good prediction for the morphology of wear, and the volume loss of the wear indication could be calculate through the combination of model computation and data analysis method. CIVA simulation results were agreed with the experimental data, the simulated data amplitude-depth curve was a linear equation when the flaws were regular and standard artificial defects.