Abstract: The solid wire with yield strength of 890MPa was used for welding test, and the effects of shielding gas,welding speed and interpass temperature on the mechanical properties of weld metal was studied by single factor method. The results show that Ar+（5%～20%）CO₂ can meet the requirements of mechanical properties. When the welding speed is in the range of 15～43cm/min, the yield ratio increases and the impact toughness first increases and then decreases with the increase of welding speed. When the welding speed is 21～23cm/min, the weld has good comprehensive mechanical properties. When the interpass temperature is 70～200℃, the weld strength decreases and the elongation increases with the increase of temperature. When the interpass temperature is 100～150℃, the weld has a good strength-toughness match, and when the interpass temperature is 180～200℃, the strength does not meet the requirements. The butt welding test was carried out by selecting the process parameters with better deposited metal properties, and the joint had good mechanical properties.