Leaf spring seat as a necessary comfort parts of automobile seats, its comfort design is particularly important. Cushion suspension spring is mostly configured in the front seat, the front end is hung on the half-pot of the cushion skeleton or on the front cross tube, and the back end is hung on the rear cross tube. The material of the body is mostly spring steel, and the shape is mostly serpentine symmetrical structure, or serpentine subjacent arrangement structure. It mainly provides foam support, wire harness connection, and face cover hookup.