A slide rail assembly, comprising: a first rail comprising a front end and a first blocking part; a second rail movably connected to the first rail, the second rail comprising a second blocking part; characterized by: a first engagement element, comprising an elastic part, having a first end fixedly connected to a first portion of the second rail and a second end tilted away from the second rail; and a second engagement element, comprising an elastic part, having a first end fixedly connected to a second portion of the second rail and a second end tilted away from the second rail, the second engagement element further having a first guiding section, wherein the first portion and the second portion of the second rail are located at different longitudinal positions on the second rail; wherein when the second rail moves relative to the first rail to a first position beyond the front end of the first rail along a direction, the second end of the first engagement element abuts against the first blocking part of the first rail for preventing the second rail from moving relative to the first rail from the first position along the direction; wherein when the second end of the first engagement element is moved toward the second rail to be operatively detached from the first blocking part of the first rail for allowing the second rail to move relative to the first rail from the first position to a second position along the direction, the second engagement element crosses the first blocking part of the first rail with assistance of the first guiding section, and the second end of the second blocking part of the second rail abuts against the first blocking part of the first rail for holding the second rail at the second position relative to the first rail. a first rail comprising a front end and a first blocking part; a second rail movably connected to the first rail, the second rail comprising a second blocking part; characterized by: a first engagement element, comprising an elastic part, having a first end fixedly connected to a first portion of the second rail and a second end tilted away from the second rail; and a second engagement element, comprising an elastic part, having a first end fixedly connected to a second portion of the second rail and a second end tilted away from the second rail, the second engagement element further having a first guiding section, wherein the first portion and the second portion of the second rail are located at different longitudinal positions on the second rail; a first engagement element, comprising an elastic part, having a first end fixedly connected to a first portion of the second rail and a second end tilted away from the second rail; and a second engagement element, comprising an elastic part, having a first end fixedly connected to a second portion of the second rail and a second end tilted away from the second rail, the second engagement element further having a first guiding section, wherein the first portion and the second portion of the second rail are located at different longitudinal positions on the second rail; wherein when the second rail moves relative to the first rail to a first position beyond the front end of the first rail along a direction, the second end of the first engagement element abuts against the first blocking part of the first rail for preventing the second rail from moving relative to the first rail from the first position along the direction; wherein when the second end of the first engagement element is moved toward the second rail to be operatively detached from the first blocking part of the first rail for allowing the second rail to move relative to the first rail from the first position to a second position along the direction, the second engagement element crosses the first blocking part of the first rail with assistance of the first guiding section, and the second end of the second blocking part of the second rail abuts against the first blocking part of the first rail for holding the second rail at the second position relative to the first rail.