In recent years, electromagnetic flow meters have been used in measuring two-phase or multi-phase flow. Using finite element program ANSYS to build simulation of non-conductive material in the fluid of electromagnetic flow meter, so it can be used to investigate the effect of electromagnetic flow meter's sensitive field response with different diameter size of measuring pipe when non-conductive material in two-phase or multi-phase flow, which provide the reference for error analysis of electromagnetic flow meter measurement with different diameter size of measuring pipe at non-conductive material in the fluid.