Surface modification of micron titanium dioxide was carried out using coupling agent (KH570) method, inorganic coating (aluminum coating) method, ultrasonic method, nonionic surfactant (PEG) method, and anionic surfactant (sodium laurate) method to improve dispersion of micron titanium dioxide. The lipophilic degree, surface morphology and particle size of micron titanium dioxide before and after modification were analyzed. The result showed that ultrasonic method (power 90 W, time 15 min, temperature 40 ℃, mass fraction of dispersant 0.5%) and anionic surfactant method (pH 5, concentration of sodium laurate 0.050 mol/L, time 30 min) are better than the other three methods; they are effective to improve the dispersion of micron titanium dioxide.