A rack comprising a slide assembly and a chassis wherein the slide assembly comprises: a first rail having a first end and a second end which is located corresponding to the first end; a second rail; a first bracket connected adjacent to the first end of the first rail; and a second bracket connected adjacent to the second end of the first rail, the first bracket includes: a bracket board having a first portion and a second portion, the second portion bending and extending from an end of the first portion; at least one projecting member connected to the second portion of the bracket board; an engaging member connected to the bracket board and having a body portion, a first fastening portion and a second fastening portion, and a resilient member for providing a force to the engaging member to maintain the first fastening portion to be positioned close to the at least one projecting member, characterized in that the engaging member is pivotally connected to the bracket board and the first and second fastening portions (62, 64) are substantially and perpendicularly connected to an end of the body portion, the second fastening portion bending and extending from an end of the first fastening portion, wherein the slide assembly is adapted for installing the chassis to the rack, the rack has a first post and a second post, the first and second posts (13, 14) each have a plurality of holes, and the chassis has a hook portion, and wherein the first rail defines a first slide path longitudinally therein, and the second rail is slidable relative to the first slide path of the first rail; a first end of the first bracket is connected adjacent to the first end of the first rail, a second end of the first bracket is adapted to be connected to the first post of the rack; a first end of the second bracket is connected adjacent to the second end of the first rail, a second end of the second bracket is adapted to be connected to the second post of the rack; an engaging space is bounded by the first post and the second fastening portion when the second end of the first bracket is connected to the first post of the rack; the first fastening portion of the engaging member is adapted to be connected to the first post of the rack by the force provided by the resilient member; and wherein the hook portion of the chassis is adapted to be inserted into the engaging space bounded by the first post of the rack and the second fastening portion of the engaging member to contact against the second fastening portion, whereby the chassis is prevented from being pulled out from the rack when being installed to the rack. a first rail having a first end and a second end which is located corresponding to the first end; a second rail; a first bracket connected adjacent to the first end of the first rail; and a second bracket connected adjacent to the second end of the first rail, the first bracket includes: a bracket board having a first portion and a second portion, the second portion bending and extending from an end of the first portion; at least one projecting member connected to the second portion of the bracket board; an engaging member connected to the bracket board and having a body portion, a first fastening portion and a second fastening portion, and a bracket board having a first portion and a second portion, the second portion bending and extending from an end of the first portion; at least one projecting member connected to the second portion of the bracket board; an engaging member connected to the bracket board and having a body portion, a first fastening portion and a second fastening portion, and a resilient member for providing a force to the engaging member to maintain the first fastening portion to be positioned close to the at least one projecting member, characterized in that the engaging member is pivotally connected to the bracket board and the first and second fastening portions (62, 64) are substantially and perpendicularly connected to an end of the body portion, the second fastening portion bending and extending from an end of the first fastening portion, wherein the slide assembly is adapted for installing the chassis to the rack, the rack has a first post and a second post, the first and second posts (13, 14) each have a plurality of holes, and the chassis has a hook portion, and wherein the first rail defines a first slide path longitudinally therein, and the second rail is slidable relative to the first slide path of the first rail; a first end of the first bracket is connected adjacent to the first end of the first rail, a second end of the first bracket is adapted to be connected to the first post of the rack; a first end of the second bracket is connected adjacent to the second end of the first rail, a second end of the second bracket is adapted to be connected to the second post of the rack; an engaging space is bounded by the first post and the second fastening portion when the second end of the first bracket is connected to the first post of the rack; the first fastening portion of the engaging member is adapted to be connected to the first post of the rack by the force provided by the resilient member; and wherein the hook portion of the chassis is adapted to be inserted into the engaging space bounded by the first post of the rack and the second fastening portion of the engaging member to contact against the second fastening portion, whereby the chassis is prevented from being pulled out from the rack when being installed to the rack.