A slide rail assembly, comprising a first rail; a second rail displaceable relative to the first rail in a longitudinal direction; a third rail; and a first slide-aiding device and a second slide-aiding device, which are both arranged on the first rail, wherein the first slide-aiding device and the second slide-aiding device both comprise a plurality of rolling members (44, 46); a first working member movably disposed on the first rail; wherein, the second slide-aiding device comprises an engaging portion; wherein, when the second rail is at a retracted position relative to the first rail, the plurality of rolling members of the first slide-aiding device and the plurality of rolling members of the second slide-aiding device support different sections (K1, K2) of the second rail; wherein, when the second rail displaces from the retracted position in a first direction for a pre-determined opening range, the second slide-aiding device follows the second rail and displaces to a pre-determined position in the first direction; wherein, when the second slide-aiding device is at the pre-determined position, the second slide-aiding device, via a blocking arrangement between the engaging portion and the first working member which is at a status, is prevented from displacing in a second direction opposite to the first direction; wherein, the first rail is movably disposed between the third rail and the second rail, the third rail comprises a releasing structure; when the first rail displaces in a second direction relative to the third rail for a pre-determined returning range, the first working member is driven by the releasing structure to no longer be at the status, such that the second slide-aiding device can displace in the second direction from the pre-determined position. a first rail; a second rail displaceable relative to the first rail in a longitudinal direction; a third rail; and a first slide-aiding device and a second slide-aiding device, which are both arranged on the first rail, wherein the first slide-aiding device and the second slide-aiding device both comprise a plurality of rolling members (44, 46); a first working member movably disposed on the first rail; wherein, the second slide-aiding device comprises an engaging portion; wherein, when the second rail is at a retracted position relative to the first rail, the plurality of rolling members of the first slide-aiding device and the plurality of rolling members of the second slide-aiding device support different sections (K1, K2) of the second rail; wherein, when the second rail displaces from the retracted position in a first direction for a pre-determined opening range, the second slide-aiding device follows the second rail and displaces to a pre-determined position in the first direction; wherein, when the second slide-aiding device is at the pre-determined position, the second slide-aiding device, via a blocking arrangement between the engaging portion and the first working member which is at a status, is prevented from displacing in a second direction opposite to the first direction; wherein, the first rail is movably disposed between the third rail and the second rail, the third rail comprises a releasing structure; when the first rail displaces in a second direction relative to the third rail for a pre-determined returning range, the first working member is driven by the releasing structure to no longer be at the status, such that the second slide-aiding device can displace in the second direction from the pre-determined position.