A bracket mounting structure, for use with a slide rail , the bracket mounting structure comprising: a bracket including a longitudinal wall ; a base disposed adjacent to the longitudinal wall and including a first space (S1) and a second space (S2); a connecting member mounted in the first space (S1); and a mounting member mounted in the second space (S2), wherein the connecting member includes a screw thread feature ; that the base , in the first space (S1), includes a connecting structure and a hole having an auxiliary screw thread feature on a wall of the hole , wherein the hole and a through hole of the connecting member lie on the same longitudinal axis and the screw thread feature and the auxiliary screw thread feature are configured to connect with a threaded element ; and wherein the bracket mounting structure further comprises a first elastic member mounted on the connecting structure and received in the first space (S1) for applying an elastic force to the connecting member ; wherein the connecting member includes a first portion , a second portion , and the through hole extending through the first portion and the second portion ; wherein at least one of the first portion and the second portion includes the screw thread feature in the through hole ; wherein, with the through hole penetrating the first portion and the second portion , the connecting member is configured to be used with a first threaded element and a second threaded element , which is longer than the first threaded element , and to pass through the through hole and to connect with the base ; and wherein the screw thread feature is configured to connect with either the first threaded element or the second threaded element , wherein the second threaded element is further configured to connect with the auxiliary screw thread feature of the base after passing through the through hole . a bracket including a longitudinal wall ; a base disposed adjacent to the longitudinal wall and including a first space (S1) and a second space (S2); a connecting member mounted in the first space (S1); and a mounting member mounted in the second space (S2), wherein the connecting member includes a screw thread feature ; that the base , in the first space (S1), includes a connecting structure and a hole having an auxiliary screw thread feature on a wall of the hole , wherein the hole and a through hole of the connecting member lie on the same longitudinal axis and the screw thread feature and the auxiliary screw thread feature are configured to connect with a threaded element ; and wherein the bracket mounting structure further comprises a first elastic member mounted on the connecting structure and received in the first space (S1) for applying an elastic force to the connecting member ; wherein the connecting member includes a first portion , a second portion , and the through hole extending through the first portion and the second portion ; wherein at least one of the first portion and the second portion includes the screw thread feature in the through hole ; wherein, with the through hole penetrating the first portion and the second portion , the connecting member is configured to be used with a first threaded element and a second threaded element , which is longer than the first threaded element , and to pass through the through hole and to connect with the base ; and wherein the screw thread feature is configured to connect with either the first threaded element or the second threaded element , wherein the second threaded element is further configured to connect with the auxiliary screw thread feature of the base after passing through the through hole . <EOS>