Abstract: The soil moisture constant is a major indicator which evaluates the soil function. The effect and mechanization of adding clay in sandy loam was investigated in this paper, which provided technological support and theoretical basis on improving sandy loam. The results showed that, the saturated hydraulic conductivity decreased with the increasing clay mixing rate, which was the 36% of sandy loam＇s when adding clay was 5% of sandy loam weight; soil field capacity, capillary water capacity and saturated water capacity increased with the increasing clay mixing rate; Moisture content of soil effective with the increment of mixed sticky showed increasing trend decreases after then.