TiO2　photocatalyst　was　coated　and　solidified　on　the　insulator　surface　to　form　a　film　with　anti-pollution-flashover　function.　The　coating　technology　was　explored,　and　XRD,　UV-Vis,　SEM　and　FT-IR　were　employed　to　characterize　the　film　structure　and　test　its　photocatalytic　activity.　The　electric　property　and　the　non-soluble　deposit　density　(NSDD)　on　line　were　also　tested,　respectively.　Comparing　with　the　insulator　without　film,　the　electric　property　of　the　insulator　with　the　film　was　not　changed　remarkably.　The　value　of　NSDD　for　the　insulator　with　the　film　was　1/35　of　that　without　film　after　six　months　hanging.　The　insulator　with　the　film　displays　a　good　photocatalytic　self-cleaning　capability　while　satisfying　the　basic　electric　performance,　and　a　function　of　anti-pollution-flashover.