Abstract: Numerical calculation of electromagnetic field in eddy current testing using FEM(finite element method) is of help in designing the coil, identifying and quantifying the defects. To validate the result of FEM, the workshop problem offered by TEAM(testing electromagnetic analysis methods) is analyzed and calculated. The impedance of single coil is calculated using analytic method, and the result is compared with that calculated by 2D FEM model. To solve the workshop problem, 3D FEM model is established and the factors affecting the result's precision are analyzed, better result is achieved in the end.