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This paper mainly studies the synthesis of titanium dioxide nanometer particles withsmall size, uniform size and good dispersion by sol-gel method to synthesize; in the meantime, it studied also the agglomeration of titanium dioxide nanoparticles, and improvedagglomeration of materials by physical and chemical methods. By SEM characterization, it isfound that the agglomeration phenomenon of titanium materials have greatly improved; Thiswork improved hydrothermal method, titanium dioxide nanowires were synthesized at lowertemperature; In order to improve the photocatalytic activity of titanium dioxide nanometers,rare earth （Yb, Er）-doped titanium materials and different proportions of Mo-dopedMo/TiO2（Mo：Ti=1%、Mo：Ti=2%、Mo：Ti=3%、Mo：Ti=4%、Mo：Ti=5%、Mo：Ti=6%、Mo：Ti=7%、Mo：Ti=8%、Mo：Ti=9%、Mo：Ti=10%、Mo：Ti=11%、Mo：Ti=12%、Mo：Ti=13%、Mo：Ti=14%、Mo；Ti=15%） composites are synthesized. Throughthe study found when the doping molybdenum is3%to6%, the morphology is uniformspherical, spherical particles is well dispersed, and the spherical boundary is clearly visible.The paper also study the photocatalytic activity of titanium dioxide particles、nanometertitanium dioxide line, rare earth doped TiO2and different amount of Mo-doped （Mo:Ti=1%,Mo:Ti=2%, Mo:Ti=3%, Mo:Ti=4%, Mo:Ti=5%, Mo:Ti=6%, Mo:Ti=7%, Mo:Ti=8%,Mo:Ti=9%, Mo: Ti=10%, Mo:Ti=11%, Mo:Ti=12%, Mo:Ti=13%, Mo:Ti=14%,Mo:Ti=15%）. It is found that for Mo doped titanium dioxide, catalytic activity is greatlyincreased, and the catalytic activity increases continuously with the increase of theconcentration of Mo. when Mo:Ti=10%, the photodegradation rate reached nearly onehundred percent in three hours.
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