RuO2-TiO2-SnO2　coated　titanium　cathodes　with　different　amounts　of　RuO2　were　obtained　by　a　sol-gel　procedure　through　painting,　sintering　and　annealing.　The　microstructure,　morphology　and　particle　size　of　the　Ti　supported　coatings　were　examined　by　XRD,　DTA　and　TEM.　Experiments　show　that　the　crystal　size　of　the　coating　is　very　fine　on　nanometer　scale,　the　average　size　is　less　than　5　nm.　The　particle　size　will　not　be　sharply　reduced　when　the　amount　of　RuO2　increased　.It　is　concluded　that　the　coatings　consist　of　a　solid　solution　(Ru,Sn,Ti)O2　with　rutile　phase　and　it　will　coexist　of　several　different　kinds　of　rutile　phases　when　the　amount　of　RuO2　enhanced.　When　the　annealing　temperature　is　as　high　as　600°C,　the　(Ru,Sn,Ti)O2　solid　solution　will　be　decomposed　and　no　matter　how　much　the　amount　of　RuO2　existed.　The　morphology　of　the　crystals　is　equiaxial　which　RuO2　has　a　little　effects　on.　There　are　ideal　microstructure　and　morphology　in　the　anode　sample　with　low　RuO2　content.