Multi-spectral antireflective coating (AR) was deposited by electron beam evaporation on MgO doped LiNbO3 crystal, and the transmission band of the coating is 1.064 μm, 1.4～1.6 μm and 3.5～4.3 μm. The laser induced damage threshold (LIDT) of un-coated and AR-coated samples were measured. The AR-coated samples have a better LIDT than un-coated crystal.