The cathode of MITL (magnetically insulated transmission line) of large scale pulse power plant can be more than ten meters, and the deflection of cantilevered structure end as a result of gravity might be as big as several centimeters. If without alignment measures, the gap error between anode and cathode will lead to obvious current loss. By taking reference of the alignment strategy of Hermes Ⅲ based on tilt spacers, a so called ‘Mini-MITL’ cathode was designed for the validation of alignment principle. According to the parameters of the designed cathode, as well as the rotating angels of the tilt spacers, a numerical coordinate model of key points of the cathode stalk was built. The vertical and horizon coordinates corrected by tilt spacers were thus got. For validation, coordinate measuring reference was built in SolidWorks environment. The coordinates of 3D simulation and numerical model matched well. The deflection of the designed cathode was simulated by SolidWorks Simulation. The rotating angles of tilt spacers were adjusted according to the simulation results to balance the vertical deflection and keep the horizon straightness. The alignment errors of vertical and horizon direction were both less than the threshold. Continuously adjusting strategy was studied based on the discretely adjusting strategy. The alignment accuracy was notably promoted after improvement.