LiNbO3 samples with different kinds of Zn ions implantation concentration are prepared by ion implantation technology and the influence of Zn ions implantation on the infrared properties of LiNbO3 crystal is also studied. The results show that Zn ions have successfully been implanted into the surface of LiNbO3 crystal in the form of nanoparticles and the depth is about 80 nm. The pure LiNbO3 crystal occurs the primary and secondary peaks where are in 3486 cm- 1, 2851 cm- 1, 2917 cm- 1, respectively. And the primary absorption peaks of the samples with three different kinds of Zn ions implantation concentration are all in 3483 cm- 1. With respect to pure LiNbO3 crystal, the position of the primary absorption peaks occur slight redshift. The position of the secondary absorption peaks almost do not changes. Zn ions implantation enhances the transmittance of x-cut LiNbO3 crystal, but reduces the transmittance of z-cut LiNbO3 crystal.