Silica-coated　negative　ion　compound　powder　body　used　in　the　coatings　with　environmental　function　were　prepared　by　the　sol-gel　method　to　deposit　silica　onto　the　surface　of　anatase　titania　nanometer　particles　in　order　to　enhance　the　dispersion　stability　of　negative　ion　compound　powder　body.　The　negative　ion　compound　powder　body　showed　greater　dispersion　stability.　With　the　different　recruitment,　negative　ion　functional　coatings　developed　can　produce　the　biggest　density.　The　results　show　that　the　negative　ion　powder　physical　ability　stable　highly　effective　production　negative　ion,　the　quantity　of　negative　ion　has　the　close　relationship　with　the　powder　body　quality,　the　measuring　temperature　and　the　measuring　distance.