With the purpose of meeting the special requirement of laser blinding weapons, choosing H4 as the material of high refractive index and YbF3 as the material of low refractive index, the film system is designed and optimized with the help of Macleod and TFCalc softwares. By adopting electron beam vaccum depositing method with the aid of ion assistant deposition technology, as well as using orthogonal matrix tests to adjust and optimize technological parameters of the materials, antireflection (AR) coatings on the substrate of sapphire to meet the demand are deposited. The transmittances at 532, 808, 905, 980 and 1064 nm are greater than 97%, and it makes the average transmittance over 92% in the 3~5 μm band. The laser induced damage threshold (LIDT) of AR coatings is further increased by adding inner barrier layer. This film can satisfy the requirement of many laser wavelengths at the same time, widening the range of its application and reducing the costs.