A hook structure for positioning a curtain and combining a curtain fabric with connecting portions includes hooks and a rope fastening module. Each hook has a hook body, an elastic hook portion extending from the hook body, and a carrier connected to the hook body. A passing-through space between the elastic hook portion and the hook body is provided for inserting the connecting portion, and the carrier has an engaging space. The rope fastening module includes fasteners and a rope connected to the fasteners, each fastener is embedded into the engaging space, so that the distance between two adjacent fasteners of the curtain fabric is maintained by the rope, and the curtain fabric is maintained in a uniform and regular wavy form.

A holder structure for a control cord of a curtain for quickly fixing the seamless control cord or a bead chain. The holder is composed of a base seat, an outer cover and elastic members and fixed on a wall face or a floor by fixing members. The base seat and the outer cover are respectively formed with two perforations. Each perforation has a cord passage formed on the same axis. The holder structure is characterized in that a thin connection block is formed at an inner end of the cord slit of the base seat to block the cord slit. When holding the control cord, with respect to a bead chain with a connector, the thin connection block keeps blocking the cord slit. With respect to a seamless control cord, the thin connection block is cut apart to unblock the cord slit for holding the seamless control cord.

A holder structure for a control cord of a curtain for quickly fixing the seamless control cord or a bead chain. The holder is composed of a base seat, an outer cover and elastic members and fixed on a wall face or a floor by fixing members. The base seat and the outer cover are respectively formed with two perforations. Each perforation has a cord passage formed on the same axis. The holder structure is characterized in that a thin connection block is formed at an inner end of the cord slit of the base seat to block the cord slit. When holding the control cord, with respect to a bead chain with a connector, the thin connection block keeps blocking the cord slit. With respect to a seamless control cord, the thin connection block is cut apart to unblock the cord slit for holding the seamless control cord.