A gate-type slide mechanism includes a first slide seat, a second slide seat having rack sections on two sides and slidably connected to the first slide seat, and a base seat slidable relative to the first slide seat. Two pivot pins are arranged on the first slide seat near two sides of the second slide seat. Two elastic extensible/compressible assemblies are pivotally disposed between two ends of the base seat and the pivot pins. The elastic extensible/compressible assemblies are pivotally rotatable around the pivot pins and elastically extensible/compressible with the sliding of the base seat to apply a resistance or aid force to the base seat. Two toothed members are disposed at the ends of the elastic extensible/compressible assemblies proximal to the second slide seat for engaging with the rack sections thereof and driving the second slide seat to slide in a direction reverse to that of the base seat.