Abstract: Multi-phase fluid flows widely occur, especially in the wellhead and oil pipelines. Besides, in most cases, conditions for creating such flows are not under the control, to ensure the design calculations such as pressure drop, multi-phase flow regime type and Gas to Liquid Ratio (GOR) should also be carefully determined. The old method of fluid flow measurement is separation of phases and their measurement by single-phase flow meter that in addition to a lot of inconvenience and expense, needs enough manpower to the continuous repair and maintenance as well. However, this equipment is not capable of continual monitoring and measurement and it cannot provide data obtained from the well for moment to moment as well. In addition, it did not also specify the output flow regime from the well. Among the multi-phase flow measurement methods because of the stability, reliability, simplicity, non-weaving, cheap price and low-safety needs the capacitor electrical method has been taken into consideration. But still, there are questions about the procedure, for example which is the best type of electrode configuration? In this study, types of important electrode configurations such as helix, concave and ring were assessed using the COMSOL application with finite element method based on the sensitivity of the response, phase distribution dependency. In short, they were the best choice for measurement of GOR of the helix type electrode and for identification of a concave configuration flow regime. Also, based on numerical simulation a new arrangement of electrodes called trifid was proposed that has the most sensitivity.