Nanoscale　TiO2　powders　doping　with　vanadium　by　oxidizing　sol-gel　process　were　prepared　using　TiCl3　as　a　source　matter.　The　influence　of　vanadium　on　the　phase　transition　was　studied,　the　changes　in　the　crystal　size　and　microstrain　distributions　obtained　at　400°C　were　analyzed.　The　results　show　that　the　substitutes　of　V+5　for　Ti+4　in　the　anatase　structure　cause　distortions,　formation　of　the　rutile　phase　and　decrease　of　crystal　size.　V+5/TiO2　powders　with　high　dispersion,　surface　area　and　activity　were　obtained.