A slide rail mechanism, comprising: a rail member; a first bracket (24, 200, 300, 400, 502, 600) movable relative to the rail member; and a reinforcing member (26, 500) arranged between the rail member and the first bracket (24, 200, 300, 400, 502, 600); wherein when the first bracket (24, 200, 300, 400, 502, 600) is moved and adjusted to an arbitrary position, the first bracket (24, 200, 300, 400, 502, 600), the rail member and the reinforcing member (26, 500) support each other; wherein the rail member comprises a first rail portion, a second rail portion and a longitudinal body connected between the first rail portion and the second rail portion, the first bracket (24, 200, 300, 400, 502, 600) comprises a first supporting portion (34a, 402, 504, 602), a second supporting portion (34b, 404, 512, 606) and a longitudinal supporting portion (36, 301, 503) connected between the first supporting portion (34a, 402, 504, 602) and the second supporting portion (34b, 404, 512, 606), the reinforcing member (26, 500) comprises a first wall portion (52a, 520a), a second wall portion (52b, 520b) and a longitudinal wall connected between the first wall portion (52a, 520a) and the second wall portion (52b, 520b); wherein the longitudinal supporting portion of the first bracket (24, 200) further comprises a first extension portion, the first extension portion and one of the first wall portion (52a, 520a) and the second wall portion (52b, 520b) of the reinforcing member are able to support each other; wherein the first wall portion of the reinforcing member comprises a first wall section and a second wall section bent relative to the first wall section, a space is defined by the first wall section and the second wall section, characterized in that the first extension portion of the first bracket (24, 200) comprises a first extension section and a second extension section bent relative to the first extension section, the second extension section is extended into the space of first wall portion, the second wall portion of the reinforcing member comprises a third wall section and a fourth wall section bent relative to the third wall section, a space is defined by the third wall section and the fourth wall section, the second extension portion of the first bracket (24, 200) comprises a third extension section and a fourth extension section bent relative to the third extension section, the fourth extension section is extended into the space of the second wall portion. a rail member; a first bracket (24, 200, 300, 400, 502, 600) movable relative to the rail member; and a reinforcing member (26, 500) arranged between the rail member and the first bracket (24, 200, 300, 400, 502, 600); wherein when the first bracket (24, 200, 300, 400, 502, 600) is moved and adjusted to an arbitrary position, the first bracket (24, 200, 300, 400, 502, 600), the rail member and the reinforcing member (26, 500) support each other; wherein the rail member comprises a first rail portion, a second rail portion and a longitudinal body connected between the first rail portion and the second rail portion, the first bracket (24, 200, 300, 400, 502, 600) comprises a first supporting portion (34a, 402, 504, 602), a second supporting portion (34b, 404, 512, 606) and a longitudinal supporting portion (36, 301, 503) connected between the first supporting portion (34a, 402, 504, 602) and the second supporting portion (34b, 404, 512, 606), the reinforcing member (26, 500) comprises a first wall portion (52a, 520a), a second wall portion (52b, 520b) and a longitudinal wall connected between the first wall portion (52a, 520a) and the second wall portion (52b, 520b); wherein the longitudinal supporting portion of the first bracket (24, 200) further comprises a first extension portion, the first extension portion and one of the first wall portion (52a, 520a) and the second wall portion (52b, 520b) of the reinforcing member are able to support each other; wherein the first wall portion of the reinforcing member comprises a first wall section and a second wall section bent relative to the first wall section, a space is defined by the first wall section and the second wall section, characterized in that the first extension portion of the first bracket (24, 200) comprises a first extension section and a second extension section bent relative to the first extension section, the second extension section is extended into the space of first wall portion, the second wall portion of the reinforcing member comprises a third wall section and a fourth wall section bent relative to the third wall section, a space is defined by the third wall section and the fourth wall section, the second extension portion of the first bracket (24, 200) comprises a third extension section and a fourth extension section bent relative to the third extension section, the fourth extension section is extended into the space of the second wall portion.