An arrangement comprising a the double-surface contact tray loading base and a bracket mounted on the side wall of a compartment and having a plurality of square holes arranged longitudinally, the double-surface contact tray loading base further comprising: a loading surface ; a hook arranged on an outer end of the loading surface and having a hook lug (1-2) and a support plate , wherein the hook lug (1-2) has an inner contact surface (1-1) at an upper end; and a longitudinal stopper wall and a transversal stopper wall arranged at adjacent edges of the loading surface ; characterized in that a reinforcement rib is arranged at the bottom of the loading surface ; the support plate is arranged on a lower side of an outer end of the loading surface , wherein the lower end of the support plate has an outer contact surface (6-1); the hook lug (1-2) is arranged on an upper side of the outer end of the loading surface and has a mounting surface at a lower end, the hook lug (1-2) being connected to the upper side of the outer end of the loading surface ; the outer end of the loading surface is tilted upwards with an angle of 3-5 degrees, and the longitudinal stopper wall is tilted towards the direction of the hook with an angle of 2-3 degrees; and when the double-surface contact tray loading base is mounted into one of the plurality of square holes of the bracket , the mounting surface of the hook lug (1-2) is pressed on the respective square hole of the bracket , the inner contact surface (1-1) of the hook lug (1-2) is in contact with the inner surface on the upper side of the bracket , and the outer contact surface (6-1) of the support plate is in contact with the outer surface on a lower side of the bracket . a loading surface ; a hook arranged on an outer end of the loading surface and having a hook lug (1-2) and a support plate , wherein the hook lug (1-2) has an inner contact surface (1-1) at an upper end; and a longitudinal stopper wall and a transversal stopper wall arranged at adjacent edges of the loading surface ; characterized in that a reinforcement rib is arranged at the bottom of the loading surface ; the support plate is arranged on a lower side of an outer end of the loading surface , wherein the lower end of the support plate has an outer contact surface (6-1); the hook lug (1-2) is arranged on an upper side of the outer end of the loading surface and has a mounting surface at a lower end, the hook lug (1-2) being connected to the upper side of the outer end of the loading surface ; the outer end of the loading surface is tilted upwards with an angle of 3-5 degrees, and the longitudinal stopper wall is tilted towards the direction of the hook with an angle of 2-3 degrees; and when the double-surface contact tray loading base is mounted into one of the plurality of square holes of the bracket , the mounting surface of the hook lug (1-2) is pressed on the respective square hole of the bracket , the inner contact surface (1-1) of the hook lug (1-2) is in contact with the inner surface on the upper side of the bracket , and the outer contact surface (6-1) of the support plate is in contact with the outer surface on a lower side of the bracket . <EOS>