09MnNiDR low-temperature steel is utilized for building and installing container. In practice,the container is sometimes required to perform two or more post weld treatment（PWHT）. This PWHT leads to the deterioration of welded joint properties,especially impact toughness at lower temperature. In this present work,The effects of different heat treatment temperatures of 545 ℃,570 ℃,600 ℃and duration time on strength and impact toughness of welded joint were studied. Three heat treatment temperatures were selected according to the installation site and condition. The result reveals that 545～600 ℃ is applicable PWHT temperature for 09MnNiDR lowtemperature steel. When PWHT times are more than twice,the proper PWHT temperature is 545～570 ℃.