The influence of structural parameters of CCD including the size of the pixel,sampling interval and sensitive area on the reconstruction image of digital holograms is discussed,and the relations between them are analyzed.Such associating structural parameters interacting with the optical arrangement for recording the digital holograms,have influences on the brightness,the size and the resolution of the reconstruction image.Considering these influences,an optimal optical setup for recording high quality digital holograms is introduced,and corresponding experimental results are given.