Abstract: A support structure for a Christmas lighting string includes a lamp bulb, lamp base, lamp holder, multiple electrical conductors, receptacles, flasher control and non-electrical conductor. The electrical conductors, lamp base and lamp holder can be connected in series, parallel, or series and parallel to form a complete circuit of the lighting strings. Non-electrical connectors and electrical conductors are connected or wound. The non-electrical connectors are simultaneously or individually fixed with the electrical conductors by knots. Thus the lamp bulbs are limited in proper spaced intervals so as to form a certain appearance, design or words and to obtain a decorative effect.