Fracture tests at low temperature (-47°C~-43°C) of 20 notched bars fabricated from E43 solder were conducted. The effect of notch radius, r, and notch depth, d/D, on fracture mode of E43 solder was studied. The experimental results demonstrate that cracks initiate at the center of notch section and the notched bars fracture at the notch section at low temperature. The fracture mode is cleavage fracture and the fracture sections are coarse. Specimens with a sharper notch radius (a smaller r) and a larger notch depth (a smaller d/D ratio) show poor ductility. The stress-strain curve of E43 solder tested on standard specimen at low temperature (-47°C~-43°C) exhibits the character of yielding, hardening and necking. The ratio of ultimate strength to yield strength, σu/σy, and the ductility, δ5, at low temperature meet to the requirement in plastic design for structural steel.