A study of the plotter and the traditional grating duplication method shows that grating by the traditional grating duplication method does not have a sufficient length to meet the requirement of the large-format plotter in location, in view of which this paper proposes the idea of piecewise exposure and successive duplication to obtain arbitrary length and width and thus meet the requirement of the large-format color inkjet plotter and other machines in location.This paper puts emphasis on the structure, c...