The　white　nano-titania　coating　were　prepared　by　sol-gel　method.　The　particle　size　of　nano-titania　was　range　between　10　and　20　nm　by　the　analysis　of　XRD　and　TEM.　In　order　to　testify　the　fact　that　the　TiO2　coating　could　be　used　to　purify　air　within　spacecraft　sealed-cabin,　the　nano-titania　coating　photocatalytic　oxidation　experiments　were　carried　out.　The　experimental　results　indicate　that　nano-titania　coating　can　degrade　the　air　contaminants　such　as　formaldehyde,　sulfur　dioxide　and　nitrogen　dioxide,　at　the　same　time,　which　can　kill　the　bacteria　and　virus　such　as　Escherichia　coli　and　Klebsiella　pneumoniae.