A new method is proposed to get higher measurement accuracy of CCD several CCD are fit together with the distance of H1=H/N,and inclined a certainty angle as α,H is pixel space-between,and N is CCD amount.By this means,the maximum error of single linear CCD is reduced to H×cosα that of multi-linear CCD is reduced to (Hcosα)/N,and that of plane CCD is reduced to h×sinα(h is row space-between of the plane CCD).Three standard pole′s diameter is measured by single CCD and two-inclined CCD,these pole...