A slide rail assembly, configured to mount a chassis to a rack, the slide rail assembly being mounted to the rack through a pair of brackets, the slide rail assembly comprising: a first rail; characterized by: a plurality of mounting members being arranged at one side of the chassis; a second rail movable relative to the first rail along a longitudinal direction, the second rail comprising a side wall and a bottom wall perpendicularly connected to the side wall; a guiding base arranged at a front end of the second rail, the guiding base comprising a first guiding section and a second guiding section, the first guiding section and the second guiding section defining an entry, an exit and a passage located between the entry and the exit; and a blocking member movably mounted on the second rail, a portion of the blocking member being located in the passage of the guiding base, said blocking member being pushed when the plurality of mounting members of the chassis pass through the passage of the guiding base; wherein during mounting the chassis to the rack, the second rail is moved out of the rack relative to the first rail, in order to allow the bottom wall of the second rail to abut against a bottom part of the chassis for further pushing the chassis into the rack, the chassis is mounted to the second rail through guiding the plurality of mounting members by the entry of the guiding base to pass through the passage and the exit of the guiding base; wherein the blocking member is configured to be operatively moved away from the passage of the guiding base in order to allow the chassis to be detached from the second rail; wherein when the plurality of mounting members of the chassis pass through the passage of the guiding bass, the blocking member is pushed; wherein the rack is a cabinet type rack. a first rail; characterized by: a plurality of mounting members being arranged at one side of the chassis; a second rail movable relative to the first rail along a longitudinal direction, the second rail comprising a side wall and a bottom wall perpendicularly connected to the side wall; a guiding base arranged at a front end of the second rail, the guiding base comprising a first guiding section and a second guiding section, the first guiding section and the second guiding section defining an entry, an exit and a passage located between the entry and the exit; and a blocking member movably mounted on the second rail, a portion of the blocking member being located in the passage of the guiding base, said blocking member being pushed when the plurality of mounting members of the chassis pass through the passage of the guiding base; a plurality of mounting members being arranged at one side of the chassis; a second rail movable relative to the first rail along a longitudinal direction, the second rail comprising a side wall and a bottom wall perpendicularly connected to the side wall; a guiding base arranged at a front end of the second rail, the guiding base comprising a first guiding section and a second guiding section, the first guiding section and the second guiding section defining an entry, an exit and a passage located between the entry and the exit; and a blocking member movably mounted on the second rail, a portion of the blocking member being located in the passage of the guiding base, said blocking member being pushed when the plurality of mounting members of the chassis pass through the passage of the guiding base; wherein during mounting the chassis to the rack, the second rail is moved out of the rack relative to the first rail, in order to allow the bottom wall of the second rail to abut against a bottom part of the chassis for further pushing the chassis into the rack, the chassis is mounted to the second rail through guiding the plurality of mounting members by the entry of the guiding base to pass through the passage and the exit of the guiding base; wherein the blocking member is configured to be operatively moved away from the passage of the guiding base in order to allow the chassis to be detached from the second rail; wherein when the plurality of mounting members of the chassis pass through the passage of the guiding bass, the blocking member is pushed; wherein the rack is a cabinet type rack.