A slide rail assembly, comprising: a first rail; a second rail, wherein the second rail and the first rail are displaceable with respect to each other in a longitudinal direction; a blocking feature provided at one of the first rail and the second rail; and a first component movably mounted on the other of the first rail and the second rail; wherein when the second rail is at a predetermined position with respect to the first rail, a first blocking portion of the blocking feature and a first predetermined portion of the first component are blocked by each other in the longitudinal direction to prevent the second rail from displacement with respect to the first rail from the predetermined position in a first direction, wherein the first blocking portion of the blocking feature forms a first non-vertical structure in a transverse direction, wherein the blocking feature has a high section and a low section in the transverse direction, wherein the high section has a first longitudinal length substantially greater than a second longitudinal length of the low section such that a first engaging space is formed, and wherein, when the second rail reaches the predetermined position with respect to the first rail, the first predetermined portion of the first component enters the first engaging space such that the first blocking portion of the blocking feature and the first predetermined portion of the first component are blocked by each other in the transverse direction; wherein the longitudinal direction is a length direction or displacement direction of the slide rails, the transverse direction is a lateral direction of the slide rails, and a vertical direction is a height direction of the slide rails; wherein the one of the first rail and the second rail includes a first wall (40a; 44a), a second wall (40b; 44b), and a longitudinal wall (42; 46) connected between the first wall (40a; 44a) and the second wall (40b; 44b), and the blocking feature protrudes with respect to the longitudinal wall (42; 46) substantially in the transverse direction such that the high section of the blocking feature has a transverse height with respect to the low section; wherein the first blocking portion is located between the low section and the high section, and the high section and the low section are so arranged that the first blocking portion has a first inclination angle and forms the first non-vertical structure. a first rail; a second rail, wherein the second rail and the first rail are displaceable with respect to each other in a longitudinal direction; a blocking feature provided at one of the first rail and the second rail; and a first component movably mounted on the other of the first rail and the second rail; wherein when the second rail is at a predetermined position with respect to the first rail, a first blocking portion of the blocking feature and a first predetermined portion of the first component are blocked by each other in the longitudinal direction to prevent the second rail from displacement with respect to the first rail from the predetermined position in a first direction, wherein the first blocking portion of the blocking feature forms a first non-vertical structure in a transverse direction, wherein the blocking feature has a high section and a low section in the transverse direction, wherein the high section has a first longitudinal length substantially greater than a second longitudinal length of the low section such that a first engaging space is formed, and wherein, when the second rail reaches the predetermined position with respect to the first rail, the first predetermined portion of the first component enters the first engaging space such that the first blocking portion of the blocking feature and the first predetermined portion of the first component are blocked by each other in the transverse direction; wherein the longitudinal direction is a length direction or displacement direction of the slide rails, the transverse direction is a lateral direction of the slide rails, and a vertical direction is a height direction of the slide rails; wherein the one of the first rail and the second rail includes a first wall (40a; 44a), a second wall (40b; 44b), and a longitudinal wall (42; 46) connected between the first wall (40a; 44a) and the second wall (40b; 44b), and the blocking feature protrudes with respect to the longitudinal wall (42; 46) substantially in the transverse direction such that the high section of the blocking feature has a transverse height with respect to the low section; wherein the first blocking portion is located between the low section and the high section, and the high section and the low section are so arranged that the first blocking portion has a first inclination angle and forms the first non-vertical structure.