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 (D1) with respect to the first rail , the slide-facilitating device is at a predetermined position (K), 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 , 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 (D1) with respect to the first rail , the slide-facilitating device is at a predetermined position (K), 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 , and the hole is configured for engagement with the engaging feature of the slide-facilitating device . <EOS>