The carbon peaking and carbon neutrality goals promotes the development of green power in China, and also puts forward new requirements for green power consumption. In the existing research, there is a gap in the field of green power consumption responsibility allocation. Focusing on this problem, the necessity of green power flow is discussed, and the corresponding relationship of carbon emission flow, power flow analysis and green power flow is outlined. Based on power flow calculation, the basic concepts and important conclusions of green power flow analysis is proposed. The proposed method is verified by IEEE 14-bus system, and the distribution characteristics of green power flow in each node of the system under different conditions are analyzed. Finally, the authors discuss the application directions of green power flow analysis.