To characterize and identify the discharge characteristics of two-phase flow, the research scheme and experimental device of two-phase flow discharge characteristics based on IEC 60270 partial discharge experimental method are designed in this paper. The PRPD (Pass Resolved Partial Discharge) method is extended to the PRPDN (Pass Resolved Partial Discharge Number) method, and an experimental method suitable for the analysis of two-phase flow discharge characteristics and the analysis method of two-phase flow characteristics are proposed, which lays a foundation for the experiment and analysis of two-phase flow discharge characteristics.