We fabricate nano-structural metal films to improve photoluminescence of perovskite films.When the perovskite fil is placed on an ammonia-treated alumina film,stronger photoluminescence is found due to local field enhancement effects.In addition,the oxide spacer layer between the metal (e.g.,A1,Ag and Au) substrate and the perovskite film plays an important role.The simulations and experiments imply that the enhancement is related to surface plasmons of nano-structural metals.