A method for automation of conventional manual operation of setting the work-pieces on the hanger (H) for transporting the work-pieces, which moves such as in the surface treatment equipment (300), so as to provide the labor and power saving effect, to improve the efficiency on the operation, and to further improve the quality of the surface of the work-piece after treatment, comprises the process to separate and align plural work-pieces which are joined and aligned; the process to support the skewer-shaped supporting member (K) supporting plural separated and aligned work-pieces while maintaining the separated and aligned configuration; and the process to hang the skewer-shaped supporting member (K) supporting the work-pieces in the separated and aligned configuration on the hanger (H).