Nanometer　70　mol%RuO2-30mol%SiO2　powders　were　synthesized　by　sol-gel　method　using　tetraethylorthosilicate(TEOS)and　citrate-gel　method　using　RuCl3.　The　structure　of　the　powders　were　characterized　by　means　of　FT-IR,　DTA-TG,　XRD,　TEM　and　BET　method.　It　is　shown　that　the　size　of　the　powder　particles　is　about　10　nm.Amorphous　SiO2　exists　in　the　range　of　experimental　temperature.　Only　crystalline　Ru　metal　exists　in　the　powders　calcined　at　200　and　400°C.　90vol%Ru　is　oxidated　into　RuO2　with　has　the　same　size　as　Ru　for　the　powders　calcined　at　600　°C.　The　powders　calcained　at　400　°C　present　superior　thermal　properties.　The　phases　of　the　powders　can　be　effectively　controlled　by　adding　SiO2,　and　it　is　favorable　for　the　preparation　of　Ti　anodes.