The invention discloses a method and a system for extending wires and is used for solving the problems in the prior art that the circuit extension efficiency is low, and stretching equipment, a rotary joint device and twisting-proof steel wire for dragging fail to meet the requirements of circuit extension. The system comprises a dragger, a plurality of tension machines, a running board and a line tackle, wherein the running board is connected with the dragger through dragging steel wire, every wire connected to the running board is connected with one tension machine, the line tackle is fixedon an iron tower and used for articulating the dragging steel wire and wire connected with the running board, the running board drags an odd number of wires, a guide bar is fixed on the running board, and the fixing position of the guide bar forms an included angle with the horizontal central axis of the running board; and a link plate is fixed on the line tackle and connected with a sliding chute on the lazy arm of the line tackle in a sliding mode. The proposal provided realizes the dragging of an odd number of wires by the running board and the line tackle, thus meeting the requirements ofwire extension and improving the efficiency of wire extension.