Abstract: To facilitate alternating current (AC) load power performance research in aircraft electric power system, the AC load semi-physical simulation technology was proposed. The technology was based on pulse width modulation rectifier topology and three-phase current decoupling control. Complex compensation structure was used to ensure rapid tracking; a one-leg was added to provide access to the neutral current; the power filter was added to reduce the switch harmonic current for obtaining the more real load characteristics in the aircraft power system side. In 115 V, 400 Hz aircraft electric power system, by using the semi-physical simulation technology, the function that AC side current tracked the given current generated by the computer digital simulation was completed. The simulation of the AC load dynamic process of power factor, current harmonics and unbalanced currents was realized. The experiment results of the semi-physical simulation show that both accuracy and speed meet requirements. The semi-physical simulation provides a design and verification tool for aircraft electric power system.