Abstract: The modulation strategies based on carrier reconstruction usually achieve low harmonic distortion of output line voltage and balanced output power of each unit at the expense of more switching actions. In this paper, an improved multi-carrier modulation strategy based on carrier reconstruction is proposed, which forms new carriers by adjusting the carrier layout of the phase disposition modulation strategy in the horizontal direction to avoid additional switching actions caused by vertical mutations of the instantaneous value of the carriers. The average power expression of one module in an interleaved-parallel inverter within a reconstructed-carrier period is derived, which indicates that the output power is balanced between the modules. The mechanism of additional switching actions caused by vertically reconstructing carriers are analyzed, and the expression of the switching times of the inverter under different modulation strategies in a single fundamental period is derived, which demonstrates that the proposed modulation strategy does not increase switching actions with horizontal reconstruction. Finally, a simulation model and an experimental platform are built to verify the correctness and feasibility of the theoretical analysis.