Abstract: For the energy loss of laser transmitting, an anti-reflection film and a high anti laser reflection film were designed and prepared according to the theory of optical thin film. Coating materials of laser films, coating design, deposition techniques and ion assisted deposition parameters were researched in detail. Results shows that the reflectance of the antireflectance coating is less than 0.2% and the average reflectance of the high reflectance film is higher than 99.7% when the laser incidence is 25~65. Furthermore, the experimental tests on 50 m optical fiber and K9 glass before and after coatings indicate that the average power of optical fiber has increased by 5% and the reflective power of the K9 glass has improve to 99.85%. Moreover, the preparation of optical films of the fiber laser effectively raises the laser damage threshold, and solves the problem of the film firmly under low temperature deposition.