1. A slide rail mechanism, comprising:a rail member;
a first supporting frame movable relative to the rail member;
a second supporting frame movable relative to the first supporting frame;
a first bracket, the first bracket and the second supporting frame being movable relative to each other, the first bracket comprising a side wall and at least one mounting member adjacent to the side wall, the at least one mounting member configured to pass through a mounting hole of a post, the first bracket being adjacent to a first end part of the rail member; and
a second bracket adjacent to a second end part of the rail member;
wherein during a process of the second supporting frame being moved relative to the first bracket along a direction from a first position to a second position, the second supporting frame is configured to drive the at least one mounting member to move relative to the side wall of the first bracket.