A slide rail assembly, comprising: a first rail; a second rail longitudinally movable relative to the first rail; a connecting part; a working member mounted to the connecting part arranged on one of the first rail and the second rail; and a contact feature arranged on the other one of the first rail and the second rail; wherein the connecting part has a first side, and a first space is defined between the working member and the first side of the connecting part; wherein during a process of the second rail being moved relative to the first rail from a first predetermined position to a second predetermined position along a first direction, the contact feature is configured to contact the working member, such that the working member is flexibly deformed through the first space, in order to allow the contact feature to cross the working member along the first direction; wherein the working member is made of a flexible material, the connecting part further has a second side opposite to the first side, and a second space is defined between the working member and the second side of the connecting part; wherein during a process of the second rail being moved relative to the first rail from the second predetermined position to the first predetermined position along a second direction opposite to the first direction, the contact feature is configured to contact the working member, such that the working member is flexibly deformed through the second space, in order to allow the contact feature to cross the working member along the second direction; wherein a first longitudinal distance is defined between the first side of the connecting part and a first edge wall of the working member in the first space, and a second longitudinal distance is defined between the second side of the connecting part and a second edge wall of the working member in the second space; the first longitudinal distance is substantially shorter than the second longitudinal distance, and, therefore, the working member has different deformation levels at the two sides of the connecting part wherein the deformation level of the working member adjacent to the second space is greater than the deformation level of the working member adjacent to the first space. a first rail; a second rail longitudinally movable relative to the first rail; a connecting part; a working member mounted to the connecting part arranged on one of the first rail and the second rail; and a contact feature arranged on the other one of the first rail and the second rail; wherein the connecting part has a first side, and a first space is defined between the working member and the first side of the connecting part; wherein during a process of the second rail being moved relative to the first rail from a first predetermined position to a second predetermined position along a first direction, the contact feature is configured to contact the working member, such that the working member is flexibly deformed through the first space, in order to allow the contact feature to cross the working member along the first direction; wherein the working member is made of a flexible material, the connecting part further has a second side opposite to the first side, and a second space is defined between the working member and the second side of the connecting part; wherein during a process of the second rail being moved relative to the first rail from the second predetermined position to the first predetermined position along a second direction opposite to the first direction, the contact feature is configured to contact the working member, such that the working member is flexibly deformed through the second space, in order to allow the contact feature to cross the working member along the second direction; wherein a first longitudinal distance is defined between the first side of the connecting part and a first edge wall of the working member in the first space, and a second longitudinal distance is defined between the second side of the connecting part and a second edge wall of the working member in the second space; the first longitudinal distance is substantially shorter than the second longitudinal distance, and, therefore, the working member has different deformation levels at the two sides of the connecting part wherein the deformation level of the working member adjacent to the second space is greater than the deformation level of the working member adjacent to the first space.