Although anatase TiO2 has good performances in many applications,it is very difficult to synthesize nanocrystalline anatase TiO2 with high specific surface areas.Herein,a two-dimensional hierarchically porous anatase TiO2 with specific surface areas of 486 m2 g-1 is fabricated through acetic acid etch and facilitate the crystal phase transition of amorphous TiO2.The ranges of pore size are 2～6 and 15～80 nm,the pore diameter centers are 3.5 and 45 nm,respectively.As the anode materials for lithium ion battery,the initial discharge capacity of hierarchically porous anatase TiO2 reaches to 449 mAh g-1 at a current rate of 0.1 A g-1 and retain 191 mAh g-1 after 60 cycles,especially the discharge capacity of 42 and 35 mA h g-1 can be resumed after 750 cycles at the current rate of 1 and 5 A g-1,exhibiting a high electrochemical stability and a high reversible capacity.The further research reveals that the fabrication of hierarchically porous anatase TiO2 depends on the adding amount of HAc and pH value in solution.