A slide rail assembly, comprising: a first rail (22, 300, 516) defining a longitudinal channel (44, 518); a bracket base (24, 304, 500) connected to the first rail (22, 300, 516); a supporting base (26, 200, 306, 402, 502) having a wall portion and at least one supporting portion (52, 206) connected transversely to the wall portion, the wall portion and the at least one supporting portion (52, 206) defining a supporting channel (54, 204) therebetween, the supporting channel (54, 204) corresponding to the longitudinal channel (44, 518) of the first rail (22, 300, 516); and a second rail (28, 202, 302, 400) movably connected to the first rail (22, 300, 516) and longitudinally displaceable relative to the first rail (22, 300, 516); wherein the at least one supporting portion (52, 206) of the supporting base (26, 200, 306, 402, 502) supports the second rail (28, 202, 302, 400) when the second rail (28, 202, 302, 400) is displaced relative to the first rail (22, 300, 516) and passes through the longitudinal channel (44, 518) of the first rail (22, 300, 516) and the supporting channel (54, 204) of the supporting base (26, 200, 306, 402, 502), characterized in that the slide rail assembly further comprises at least one connecting element and the bracket base (24, 306) has at least one longitudinal groove, wherein the supporting base (26, 200, 306, 402, 502) is movably mounted to the at least one longitudinal groove of the bracket base (24, 304, 500) via the at least one connecting element in a way that the supporting base is driven by friction by the second rail (28, 202, 302, 400), when the second rail (28, 202, 302, 400) is displaced towards an extended position. a first rail (22, 300, 516) defining a longitudinal channel (44, 518); a bracket base (24, 304, 500) connected to the first rail (22, 300, 516); a supporting base (26, 200, 306, 402, 502) having a wall portion and at least one supporting portion (52, 206) connected transversely to the wall portion, the wall portion and the at least one supporting portion (52, 206) defining a supporting channel (54, 204) therebetween, the supporting channel (54, 204) corresponding to the longitudinal channel (44, 518) of the first rail (22, 300, 516); and a second rail (28, 202, 302, 400) movably connected to the first rail (22, 300, 516) and longitudinally displaceable relative to the first rail (22, 300, 516); wherein the at least one supporting portion (52, 206) of the supporting base (26, 200, 306, 402, 502) supports the second rail (28, 202, 302, 400) when the second rail (28, 202, 302, 400) is displaced relative to the first rail (22, 300, 516) and passes through the longitudinal channel (44, 518) of the first rail (22, 300, 516) and the supporting channel (54, 204) of the supporting base (26, 200, 306, 402, 502), characterized in that the slide rail assembly further comprises at least one connecting element and the bracket base (24, 306) has at least one longitudinal groove, wherein the supporting base (26, 200, 306, 402, 502) is movably mounted to the at least one longitudinal groove of the bracket base (24, 304, 500) via the at least one connecting element in a way that the supporting base is driven by friction by the second rail (28, 202, 302, 400), when the second rail (28, 202, 302, 400) is displaced towards an extended position.