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The research of improving thermal properties of cool storage medium using nanocomposite technology is proposed in this paper. The nanocomposite cool storage material was prepared by the method of mixing directly. The effect of dispersant, ultrasonic time and concentration of dispersant were deeply researched. The optimizing concentration of dispersant and the optimizing dispersion process conditions are confirmed. The results show that thermal conductivity of TiO2 /HS-6 nanofluids is noticeably enhanced to compare base fluid HS-6, the increasing extent is 21.5%. The results provide the basic data for the application research of TiO2 nanoparticles in PCM for air-conditioning system.