Abstract: A set of data about soil water contents corresponding to soil water potentials were collected in the center of Taklimakan Desert. A water retention equation based on a closed form equation quf forwarded by Van Genuchten was established by using this set of data, and as a results, there were small differences between calculated values and observed values. Meanwhile, an equation for soil water conductivity vs soil water potential was also established by employed the equation forwarded by Mualem. Finally, equations for soil water diffusion vssoil water potential and soil water capacity vs soil water were calculated by using above two results. From above calculated equations, the results shows that the water retention curve sharp declined when soil water potentials were between 0～300 cm. Also, in corresponding to this characteristic, the soil water conductivity and soil water capacity were larger than those of clay when soil water potentials were between 0～300 cm.

Key words: Taklimakan Desert, Soil water retention curve, Soil water conductivity, Soil water diffusion, Soil water capacity