A slide rail assembly includes a rail member, first and second brackets, a blocking member, and an elastic member. The two brackets are mounted to the rail member and are detachably attached to first and second posts of a rack respectively. The blocking member is movably connected to the second bracket, which can remain at a first position with respect to the blocking member thanks to the elastic member. After the first bracket is detached from the first post, the rail member can be displaced, and thus move the blocking member, in a direction so that the second bracket is displaced from the first position to a second position with respect to the blocking member and separated from the second post.