A slide rail assembly, applicable to a furniture assembly comprising a first furniture member and a second furniture member comprising: a first rail; a second rail movable relative to the first rail, the second rail having a first function member; a third rail movable relative to the second rail, the third rail having a second function member; wherein: a first sliding auxiliary device arranged between the first rail and the second rail, the first sliding auxiliary device having a first function portion, wherein the first function portion is fixedly arranged on the first sliding auxiliary device; a second sliding auxiliary device arranged between the second rail and the third rail, the second sliding auxiliary device having a second function portion, wherein the second function portion is fixedly arranged on the second sliding auxiliary device; a first gear arranged on the second rail, wherein the first gear is configured to mesh between the first function portion of the first sliding auxiliary device and the second function portion of the second sliding auxiliary device; and a second gear arranged on the second sliding auxiliary device, wherein the second gear is configured to mesh between the first function member of the second rail and the second function member of the third rail; wherein the first gear is rotatable relative to the second rail through a shaft, and the second gear is rotatable relative to the second sliding auxiliary device through another shaft; and characterised in that: the first gear is rotatably connected in a mounting base and the mounting base accommodates in a first space of the second rail, and the second gear accommodates in a second space of the second sliding auxiliary device. a first rail; a second rail movable relative to the first rail, the second rail having a first function member; a third rail movable relative to the second rail, the third rail having a second function member; wherein: a first sliding auxiliary device arranged between the first rail and the second rail, the first sliding auxiliary device having a first function portion, wherein the first function portion is fixedly arranged on the first sliding auxiliary device; a second sliding auxiliary device arranged between the second rail and the third rail, the second sliding auxiliary device having a second function portion, wherein the second function portion is fixedly arranged on the second sliding auxiliary device; a first gear arranged on the second rail, wherein the first gear is configured to mesh between the first function portion of the first sliding auxiliary device and the second function portion of the second sliding auxiliary device; and a second gear arranged on the second sliding auxiliary device, wherein the second gear is configured to mesh between the first function member of the second rail and the second function member of the third rail; wherein the first gear is rotatable relative to the second rail through a shaft, and the second gear is rotatable relative to the second sliding auxiliary device through another shaft; and characterised in that: the first gear is rotatably connected in a mounting base and the mounting base accommodates in a first space of the second rail, and the second gear accommodates in a second space of the second sliding auxiliary device. a first sliding auxiliary device arranged between the first rail and the second rail, the first sliding auxiliary device having a first function portion, wherein the first function portion is fixedly arranged on the first sliding auxiliary device; a second sliding auxiliary device arranged between the second rail and the third rail, the second sliding auxiliary device having a second function portion, wherein the second function portion is fixedly arranged on the second sliding auxiliary device; a first gear arranged on the second rail, wherein the first gear is configured to mesh between the first function portion of the first sliding auxiliary device and the second function portion of the second sliding auxiliary device; and a second gear arranged on the second sliding auxiliary device, wherein the second gear is configured to mesh between the first function member of the second rail and the second function member of the third rail; wherein the first gear is rotatable relative to the second rail through a shaft, and the second gear is rotatable relative to the second sliding auxiliary device through another shaft; and characterised in that: the first gear is rotatably connected in a mounting base and the mounting base accommodates in a first space of the second rail, and the second gear accommodates in a second space of the second sliding auxiliary device.