Abstract: In the welding H-shaped steel of steel structure members, the welding of thick plate T-shape penetration weld is mainly based on artificial gas shielded arc welding, and the efficiency is low. This paper introduces the welding process test of T-shaped joint penetration welding of H-shaped steel thick plate by narrow-gap gas-electric vertical welding method, which provides a useful welding process method for T-shaped penetration welding of H-shaped steel thick plate.