Abstract: To promote the application of corrosion resistant rebars of high performances and reveal the mechanical performances, based on the optimization of welding parameters, the welding process of indirect butt splices in single side welding applied widely in practices was adopted and the welded specimens for three specification rebars ϕ16, ϕ25 and ϕ32 of HRB500a and HRB500c were prepared. The microstructure, mechanical properties of splices of being welded were tested and measured.The test results showed that both steels of HRB500a and HRB500c had good welding performances in cases of reasonable welding rods and welding processes with indirect butt splices in single side welding.