In recent years, with the demand and development of high-power and high-energy laser systems, the anti-laser capability of optical films has become one of the bottlenecks restricting the development of high-quality laser systems. Based on the different preparation methods and process parameters, the damage threshold of the film will have an important impact. The methods for improving the damage threshold of the film before, during and after plating were briefly introduced, including the film material selection, membrane system design, solvent cleaning, ion beam cleaning, preparation method, ion beam post-processing, laser pretreatment, and etc.