Multilayer　CdZnS　(CZS)　thin　film　was　deposited　on　soda　lime　glass　substrates.　After　deposition,　the　films　were　vacuum　and　air　annealed　at　100　degrees　C,　200　degrees　C,　300　and　400　degrees　C　for　1　h.　Effects　of　vacuum　and　air　annealing　on　structural,　morphological,　optical,　and　electrical　properties　of　multilayer　CZS　films　with　increasing　annealing　temperature　(IAT)　were　studied.　The　structural　analysis　revealed　that　the　films　were　polycrystalline　with　hexagonal　structure　having　a　prominent/intensive　peak　along　the　(002)　plane　at　300　and　400　degrees　C.　The　crystallite　size　of　nanoparticles　increased　from　18.4　to　20.5　nm　under　air　annealing　and　from　18.4　to　26.9　nm　under　vacuum　annealing,　showing　the　significance　of　annealing　on　nanoparticle　grain　growth.　According　to　morphological　analysis,　the　multilayer　technique　provides　homogeneous　film　distribution　over　the　substrate.　The　transmittance　graphs　of　films　revealed　that　it　increased　up　to　92%　in　the　visible　and　NIR　regions　under　vacuum　annealing　and　up　to　52%　under　air　annealing.　Vacuum　annealing　enhanced　the　band　gap　energies　more　significantly　than　air　annealing.　The　electrical　resistivity　increased　with　IAT,　showing　that　structural,　morphological,　optical,　and　electrical　properties　of　the　multilayer　thin　films　of　CZS　were　strongly　dependent　on　vacuum　and　air　annealing.