Titanium　anodes　were　sol-gel　coated　with　RuO2+SnO+TiO2　containing　various　amounts　of　SnO2　by　brushing,　sintering　and　annealing.　The　effect　of　SnO2　on　the　microstructure,　morphology　and　particle　size　of　the　RuO2+TiO2+SnO2/Ti　coatings　was　examined　by　XRD,　DTA　and　TEM.　It　was　concluded　that　the　crystal　size　of　the　coatings,　which　was　on　the　scale　of　nanometers,　was　sharply　reduced　with　increasing　SnO2　content.　At　the　same　time,　it　was　shown　that　the　coatings,　which　mainly　consisted　of　a　solid　solution-　(Ru,Sn,Ti)O2,　would　remain　stable　and　monophase　during　the　increase　of　the　SnO2content　and　the　annealing　temperature.　The　morphology　of　the　RuO2+TiO2+SnO2　crystals　in　the　coating　was　equiaxial　largely　due　to　the　presence　of　the　SnO2.