Over the past few decades, degradation and stability of SOEC has been a major concern for long term applications. Numerous factors such as cell fabrication, materials selection including both cell components and metallic interconnects, operation voltage and current density, working temperatures, gas compositions, stacking techniques, etc., can all affect the stability. While seemingly it is challenging to separately identify and determine the contribution of each factor, delamination of oxygen electrode was reported as one of the main reasons for this degradation or failure [1-3]. Theoretical analyses, particularly by Anil Virkar, have shown that the actual oxygen chemical potential inside the electrolyte can be well above or below the corresponding values at the two electrodes in a SOEC when using predominantly oxygen ionic conducting membranes, leading to either delamination at oxygen electrode or electro-reduction near the fuel electrode [4-6]. Therefore, it is critical to measure electronic conductivity in the electrolytes.Meanwhile measurement of electronic conductivity in MIEC is typically done by the classical Hebb-Wagner (H-W) polarization method[7, 8]. Over the past decades, it has been realized that the H-W method has some critical limitations or issues that may limit its accuracy or testing feasibility, such as relatively long relaxation time towards steady state, challenges on sealing, violation of true ionic blocking and possible interaction with gas phases. A few modified versions of H-W techniques and also non-H-W type techniques on electronic conductivity measurement have been reported and investigated[9-12] . In this report, a brief review is given to cover both of these topics.