In order to fully understand the key factors affecting resistance welding quality of nuclear fuel rods, the forming process of fuel rod end plug resistance welding was analyzed, and the influence of welding current, upsetting pressure and welding time on the welding quality of butt weld of zirconium alloy fuel rod was discussed by using domestic pressure resistance welding equipment, compared with the imported equipment, the domestic equipment adopted new design on the core components such as upsetting device and electrode clamp, which resulted in great difference in welding forming，it was observed that Joint length of typical upsetting welding was over 2 mm that could be used by ultrasonic testing to visually detected weld defects, the inspection on appearance status of the welding and metallographic structure also showed that the domestic equipment had good welding property.
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