A suspension mounting mechanism for selectively connecting to ceiling structures (C1, C2) of different sizes, the suspension mounting mechanism adapted to be mounted on a first ceiling structure having a first structural width and adapted to be mounted on a second ceiling structure having a second structural width wider than the first structural width, the suspension mounting mechanism comprising: a suspension bracket comprising a first bracket opening and a second bracket opening; a first holding hook affixed to the suspension bracket, and a first stopping unit moveably disposed on the suspension bracket; a second holding hook affixed to the suspension bracket, and a second stopping unit moveably disposed on the suspension bracket; and a locking unit (601, 602, 603, 604), wherein in a locked state, the locking unit (601, 602, 603, 604) is configured to restrict a movement of the first stopping unit relative to the suspension bracket, and in an unlocked state, the restriction of the locking unit (601, 602, 603, 604) toward the first stopping unit is removed; characterized in that: the first stopping unit comprises a first elastic sheet and a second elastic sheet adapted to pass through the first bracket opening, and protrude from an upper surface of the suspension bracket to contact the ceiling structure (C1, C2), such that the first stopping unit is pressed and moved by the first ceiling structure in a first state of assembly, and is pressed and moved by the second ceiling structure in a second state of assembly; the second stopping unit comprises a third elastic sheet and a fourth elastic sheet adapted to pass through the second bracket opening, and protrude from the upper surface of the suspension bracket to contact the ceiling structure (C1, C2), such that the second stopping unit is pressed and moved by the first ceiling structure in the first state of assembly, and is pressed and moved by the second ceiling structure in the second state of assembly; and wherein: - in a first mounting state, the first holding hook and the first elastic sheet are configured to abut one side of the first ceiling structure, and the second holding hook and the third elastic sheet are configured to abut another side of the first ceiling structure; and - in a second mounting state, the first holding hook and the second elastic sheet are configured to abut one side of the second ceiling structure, the second holding hook and the fourth elastic sheet are configured to abut another side of the second ceiling structure, and the first elastic sheet and the third elastic sheet are configured to be pressed by a bottom surface of the second ceiling structure at the same time. a suspension bracket comprising a first bracket opening and a second bracket opening; a first holding hook affixed to the suspension bracket, and a first stopping unit moveably disposed on the suspension bracket; a second holding hook affixed to the suspension bracket, and a second stopping unit moveably disposed on the suspension bracket; and a locking unit (601, 602, 603, 604), wherein in a locked state, the locking unit (601, 602, 603, 604) is configured to restrict a movement of the first stopping unit relative to the suspension bracket, and in an unlocked state, the restriction of the locking unit (601, 602, 603, 604) toward the first stopping unit is removed; the first stopping unit comprises a first elastic sheet and a second elastic sheet adapted to pass through the first bracket opening, and protrude from an upper surface of the suspension bracket to contact the ceiling structure (C1, C2), such that the first stopping unit is pressed and moved by the first ceiling structure in a first state of assembly, and is pressed and moved by the second ceiling structure in a second state of assembly; the second stopping unit comprises a third elastic sheet and a fourth elastic sheet adapted to pass through the second bracket opening, and protrude from the upper surface of the suspension bracket to contact the ceiling structure (C1, C2), such that the second stopping unit is pressed and moved by the first ceiling structure in the first state of assembly, and is pressed and moved by the second ceiling structure in the second state of assembly; and wherein: - in a first mounting state, the first holding hook and the first elastic sheet are configured to abut one side of the first ceiling structure, and the second holding hook and the third elastic sheet are configured to abut another side of the first ceiling structure; and - in a second mounting state, the first holding hook and the second elastic sheet are configured to abut one side of the second ceiling structure, the second holding hook and the fourth elastic sheet are configured to abut another side of the second ceiling structure, and the first elastic sheet and the third elastic sheet are configured to be pressed by a bottom surface of the second ceiling structure at the same time. - in a first mounting state, the first holding hook and the first elastic sheet are configured to abut one side of the first ceiling structure, and the second holding hook and the third elastic sheet are configured to abut another side of the first ceiling structure; and - in a second mounting state, the first holding hook and the second elastic sheet are configured to abut one side of the second ceiling structure, the second holding hook and the fourth elastic sheet are configured to abut another side of the second ceiling structure, and the first elastic sheet and the third elastic sheet are configured to be pressed by a bottom surface of the second ceiling structure at the same time.