In　recent　years,　metal　halide　perovskites　have　become　new　promising　materials　in　the　field　of　optoelectronic　applications　due　to　the　advantages　of　high　optical　absorption　coefficient,　high　color　purity,　wide　color　gamut,　continuously　adjustable　luminescence　wavelength,　high　photoluminescence　quantum　yield,　large　carrier　diffusion　length,　stable　ingredients　and　not　easy　to　decompose,　and　have　excellent　performance　in　solar　cells,　light-emitting　diodes,　memristors,　lasers,　photodetectors　and　anti-counterfeiting　labels.　Furthermore,　perovskites　can　be　made　by　simple　methods　like　solution　synthesis,　which　provides　the　possibility　of　combining　it　with　the　printing　process,　large-scale　production　and　industrialization.　In　this　experiment,　solution-processed　CsPbBr3　perovskite　films　grown　in　situ　have　a　preferred　orientation　on　the　(100)　crystal　plane,　and　its　interplanar　spacing　is　smaller　than　the　value　from　PDF　standard　card.　As　the　concentration　of　precursor　increases,　the　morphological　structure　of　samples　varied,　continuity　and　compactness　of　films　were　improved,　crystal　grains　were　refined,　the　photoluminescence(PL)　intensity　excited　by　light　at　375　nm　was　approximately　5　times　original,　the　PL　peak　position　blue　shifted　by　6　nm,　and　the　lattice　distortion　caused　by　this　process　increased　the　full　width　at　half　maximum(FWHM)　of　the　PL　spectrum　by　more　than　2　nm.　©　2020,　Science　Press.　All　right　reserved.