A　low-temperature　chemical　bath　deposition　(CBD)　technique　has　been　used　for　the　preparation　of　Mn3O4　thin　films　on　glass　substrates.　The　kinetic　behavior　and　the　formation　mechanism　of　the　solid　thin　films　from　the　aqueous　solution　have　been　investigated.　Structure　(X-ray　diffraction　and　Raman),　morphological　(atom　force　microscope),　optical　(UV-visible　and　near　infrared),　and　magnetic　characterizations　of　the　deposited　films　are　presented.　The　results　indicate　that　the　deposited　Mn3O4　thin　films　of　smooth　surface　with　nanosized　grains　are　well　crystalline　and　display　the　size-dependent　optical　and　magnetic　properties.