Aiming at improving the finishing effect and durability of feather keratin (FK) on polyester fabric, phytic acid (PA) was added to FK finishing solution in this paper. The morphology and structure of polyester fabrics before and after finishing were characterized by SEM and FTIR. Meanwhile, the influence of PA on the surface static contact angle, wicking height and antistatic property of the polyester fabrics finished by FK were comparatively analyzed. Besides, the retention rate of the FK on the fabrics after washing was also comparatively testd. The results show that compared with the polyester fabric finished only by FK, with the addition of the PA component, the adhesion amount of FK on the surface of the polyester fabric is increased, simultaneously the wicking height and antistatic property of the finished polyester fabric are improved, and the static contact angle of the surface is decreased. Also, the durability of the FK finished polyester fabric is enhanced by adding PA, and the higher FK retention rate is maintained after washing with the same process.