Nanometer　RuO2-SnO2　was　synthesized　by　the　citrate-gel　method　using　RuCl3,　SnCl4　as　cation　sources,　citric　acid　as　complexing　agent　and　anhydrous　ethanol　as　solvent.　The　structures　of　the　derived　powders　were　characterized　by　thermogravimetric　and　differential　thermal　analysis,　X-ray　diffraction,　transmission　electron　microscope,　and　Brunauer-Emmett-Teller　surface　area　measurement.　The　pure,　fine　and　amorphous　powders　was　obtained　at　160　degrees　C.　The　materials　calcined　at　above　400　degrees　C　were　composed　of　rutile-type　oxide　phases　having　particle　sizes　of　fairly　narrow　distribution　and　good　thermal　resistant　properties.　By　adding　SnO2　to　RuO2,　the　Ru　metallic　phase　can　be　effectively　controlled　under　a　traditional　temperature　of　preparation　for　dimensional　stable　anode.