Effect of water movement by soil potential under different temperature was studied. The results showed that unsaturated water transmitting rate was rising with the increasing of soil potential in case that temperature was constant, the rising value in cultivated loessial soil was larger than that in lou soil, and was rising with temperature rising in case that soil water content was constant, the value of temperature effect of unsaturated water transmitting rate (dk/dt) in lou soil was larger than that in cultivated loessial soil. Water transmitting rate of unsaturated soil also increased with the increasing of relative partial molal free energy variation,[Δ(ΔG)], and relative partial molal enthalpy variation,[Δ(ΔH)],in case that soil water content was constant. The increasing of water transmetting rate in cultivated loessial soil was larger than that in lou soil. The equations were regressed between [Δ(ΔG)] and [Δ(ΔH)] and k, they had better suitable.