The effects of welding currents of 200A，240A and 280A on microstructure and mechanical properties of ZL114A alloy repair welding process holes were investigated using optical and scanning electronicmicroscope (SEM)，tensile testing machine，respectively. With the increase of current intensity，the heat affected zones widen and grain size almost unchanges，but the grain size increases apparently in fusion zone. At 240A，the amount of pore is the least at fusion zone，and the eutectic phases distribute uniformly in heat affected zone，thehardness reaches the maximum value. The results of tensile test show that the fracture of tensile samples all locate in heat affected zone. At 240A，the sample tensile strength is closest to that of the base metal，and reaches ninety-five percent of the base metal tensile strength. So the optimized repair welding current is 240A