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 ; 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 ; 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. <EOS>