A slide rail mechanism is configured to a cabinet (22). The cabinet (22) includes a wall (38) with a first side (S 1) and a second side (S2) opposite to the first side (S 1). The slide rail mechanism includes a first slide rail assembly (26), a second slide rail assembly (28) and a working member (40). When a second rail (56) of the first slide rail assembly (26) is opened with respect to a first rail (54), the second rail (56) is able to drive the working member (40) for preventing a fourth rail (60) of the second slide rail assembly (28) to be opened with respect to a third rail (58).