The effects of some physical and chemical properties of soil on the electrode potential of aluminium in soils were studied. Results demonstrate that the soil pH, soil salts, soil moisture and soil compactness affect the electrode potential of aluminium in soils apparently. Three regions can be divided according to the effect of pH. The electrode potential of aluminium is negatively correlated with the soil pH in acid and alkaline regions. And there is a voltage-plateau under nearneutral pH, indicating that in this region the effect of the soil pH on the electrode potential of aluminium can be neglected. Different soils have special pH ranges of voltage-plateau, own to their different characteris.ics. Increasing soil salt content causes a shift of electrode potential to negative direction, especially in variable charge soils. Three regions are also found concerning the influence of soil moisture on the electrode potential of aluminium, which went down to the negative direction as soil moisture increased and showed little change after saturation. However, in a narrow range of moisture near saturation point of soil, a large voltage-drop appzared. At the samc level of soil moisture, a negative correlation was observed between the electrode potentials and bulk density which is an index of soil compactness.