Abstract: The authors modeled and simulated defect testing of large diameter pipeline based on remote field eddy current (RFEC) using ANSYS. According to the characteristic of RFEC inspection technique, two step method “Zoom In” was used. First, we simulated the whole RFEC model without defects and got the magnetic field distribution, then simulated the local model with defects using previous results as boundary condition. This method reduced the size of 3D model with defects in the pipeline, and improved the efficiency and accuracy of RFEC testing simulation. It is possible to model and simulate of RFEC testing of large diameter pipeline on PC.