Abstract: Titanium dioxide (TiO<SUB>2</SUB>) photocatalysts were prepared by&nbsp; sol-precipitation method and characterized by XRD and isothermal nitrogen adsorption-desorption．Effects of calcination temperature on crystal phase,grain size,and micropore structure were investigated．Experimental results indicated that phase of TiO<SUB>2</SUB> changes from anatase to rutile and grain size of TiO<SUB>2</SUB> also increases along with elevation of calcination temperature.However,specific area and pore volume had diminishing tendency gradually.In addition,microstructure can also change greatly with variation of calcination temperature．