Ultrafine　titanium　dioxide　(TiO2)　nanocrystal　has　attracted　enormous　interest　due　to　their　unusual　quantum　and　surface　effects.　Here,　we　propose　a　facile　route　to　synthesize　ultrafine　anatase　nanocrystal　at　room　temperature　via　an　aqueous　sol-gel　method　using　lactic　acid　(LA)　and　acetylacetone　(Acac)　as　double　chelators.　Transmission　electron　microscopy　(TEM)　and　size　analyzer　confirmed　that　TiO2　nanocrystal　in　precursor　possessed　an　average　size　of　similar　to　3　nm　with　a　narrow　size　distribution.　Crystal　structure　characterized　by　TEM　and　X-ray　diffraction　(XRD)　indicated　that　TiO2　nanocrystal　to　be　anatase　phase.　The　results　of　field　emission　scanning　electron　microscopy　(FE-SEM)　and　BET　surface　area　exhibited　that　TiO2　xerogel　powder　had　mono-dispersed　particles　size　and　large　BET　surface　area　up　to　90　m(2)/g.