The electric rod is also known as a telescopic high pressure bar, high voltage discharge bar, etc. High voltage discharge rods are made from new insulation materials. It has features that can elongate and contract. Portable telescopic type high voltage discharge rod is easy to use in various outdoor high voltage test, especially after dc withstand voltage test on the sample (s) to the accumulation of charge, to discharge, to ensure personal safety. Telescopic high voltage drop bar is easy to carry, convenient and flexible, with small size, light weight and safety.