Electrical properties of OPC (Organic Photoconductor) drum have been measured by using liquid electrode contact method. On conventional measurement for electrical characterization of OPC drum, some simulators made based on electrophotographic process have been used. Meanwhile, on the liquid electrode contact method, there are the features that the liquid electrode is put on OPC directly, which can maintain stable charge supply to surface of OPC drum, and measurement area is fixed,. And the time required for fatigue of OPC drum was significantly reduced compared to conventional method when water was used as a liquid electrode. Additionally, it is also an advantage that the surface of OPC drum is unsoiled before and after testing, unlike the methods using vapor-deposited films etc. In this report, we aimed to capture, assess and compare the characteristics of the OPC drum by using liquid electrode contact method.