When compiling the pre-installed process card, the wires of the same color, the same wire diameter, the same terminal, and the same sheath at one end must be marked with a marker of the same color at both ends of one of the wires for process error prevention to avoid the other end. The wire goes through the wrong sheath or hole, resulting in rework. The order of the kanban wires in the pre-installed material wire drum should be consistent with the threading sequence of the main sheath of the pre-installed process card, which can greatly improve the operator’s pre-installation operation speed and avoid threading dislocation. The pre-assembly sequence of the sheath is marked on the pre-assembly process card, and the label is pasted with the address of the line barrel and the QR code label of the kanban, so as to avoid the mistake of the batching personnel on the line and the mistake of the pre-assembler taking the line.