Abstract: Studied here in the article is the regularity of the effect by the aging temperature on the structure and properties of the new nickel-saving duplex stainless steel. The result shows that the new nickel-saving duplex stainless steel as aged at 650~850 ℃ for half an hour increases its tensile strength and yield strength ratio,and decreases its yield strength,impact energy,ferrite content and hardness;and that 700 ℃ is the most sensitive temperature for precipitation of the new nickel-saving duplex steel;when the said steel is aged at 700 ℃ for half an hour,there are carbides precipitated at grain boundaries and in grains. Therefore it needs to get the new nickel-saving duplex stainless avoid staying for a long time at the temperature ranging as 650~850 ℃.