A slide rail assembly, comprising: a first rail including a channel; a second rail movably mounted in the channel of the first rail, the second rail being displaceable with respect to the first rail; and a slide-facilitating device movably mounted between the first rail and the second rail, the slide-facilitating device including an engaging feature; and a working member provided on the first rail, the working member including a main body portion, an elastic portion, and a predetermined portion, wherein the elastic portion is configured to support the main body portion, and the predetermined portion is connected to the main body portion; wherein when the second rail is moved out of the channel of the first rail after displacement in an opening direction with respect to the first rail, the slide-facilitating device is at a predetermined position, and the engaging feature of the slide-facilitating device is engaged with the predetermined portion of the working member; wherein the first rail includes a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the first rail; and the first wall, the second wall, and the longitudinal wall of the first rail jointly define the channel; wherein said first rail is provided with a supporting portion for supporting the elastic portion of the working member; wherein the working member is movably mounted on the longitudinal wall of the first rail; wherein the predetermined portion of the working member includes a first guiding feature, a second guiding feature, characterized in that said predetermined portion further includes a hole located between the first guiding feature and the second guiding feature, the hole is defined by a plurality of hole walls (68a, 68b, 68c, 68d), and the hole is configured for engagement with the engaging feature of the slide-facilitating device. a first rail including a channel; a second rail movably mounted in the channel of the first rail, the second rail being displaceable with respect to the first rail; and a slide-facilitating device movably mounted between the first rail and the second rail, the slide-facilitating device including an engaging feature; and a working member provided on the first rail, the working member including a main body portion, an elastic portion, and a predetermined portion, wherein the elastic portion is configured to support the main body portion, and the predetermined portion is connected to the main body portion; wherein when the second rail is moved out of the channel of the first rail after displacement in an opening direction with respect to the first rail, the slide-facilitating device is at a predetermined position, and the engaging feature of the slide-facilitating device is engaged with the predetermined portion of the working member; wherein the first rail includes a first wall, a second wall, and a longitudinal wall connected between the first wall and the second wall of the first rail; and the first wall, the second wall, and the longitudinal wall of the first rail jointly define the channel; wherein said first rail is provided with a supporting portion for supporting the elastic portion of the working member; wherein the working member is movably mounted on the longitudinal wall of the first rail; wherein the predetermined portion of the working member includes a first guiding feature, a second guiding feature, characterized in that said predetermined portion further includes a hole located between the first guiding feature and the second guiding feature, the hole is defined by a plurality of hole walls (68a, 68b, 68c, 68d), and the hole is configured for engagement with the engaging feature of the slide-facilitating device.