Based on the switching characteristic of insulated gate bipolar transistor (IGBT), this paper proposes a structure and parameter design method of hybrid on-load tap changer for distribution transformer by adding an auxiliary switching circuit composed of IGBT and power diode to the mechanical on-load tap changer. The proposed structure leads power electronic switches in when the tap is switched, and realizes the on-load arcless adjustment of the distribution transformer tap by utilizing the switching performance of the power electronic switches. Finally, the simulation model of hybrid on-load tap changer for distribution transformer is built in MATLAB/Simulink, which verifies the feasibility of the proposed structure and parameter design method of hybrid on-load tap changer.