With optical fiber image plane hologram，the hologram of higher diffraction efficiency can be obtained and larger object image can be reconstrueted. The influence of the single fiber core diameter size of image-carrying optical fiber bundle on the outlet optical field under the excitation of coherent light is analyzed. The different effects of low-order modes and high-order modes in the outlet optical field on hologram are discussed. On the basis of above, it is suggested and verified experimently that the diffraction efficiency and resolution of optical fiber image plane hologram can be improved by decreasing the single fiber core diameter and increasing the number of the single fiber of image-carrying bundle.