Abstract: The current power theory is not suitable for the widely applied phase-controlled rectifier circuit. The process of AC energy transmission was analyzed, and it is shown that the AC pure resistance load is also accompanied with instantaneous reactive energy flow. Firstly, the overview of electromagnetic energy transmission was introduced by the Poynting equation, and instantaneous active and reactive energy flow were quantified by Lissajous graphs. Then the stereogram and its two-dimension projections, used to solve the instantaneous active power and the reactive energy flow, were plotted based on the network side voltage and current waveform of the single phase full wave phased-controlled rectifier circuit with pure resistance load. A new method of solving the reactive energy flow was proposed, in which the reactive energy flow was calculated by triangle area. The new method proposed can provide some references for the reactive power identification and compensation of phase controlled rectifier circuit.