The effect of magnetic plLouph on ploughing resistance was studied. The results show chat magnetic plough could reduce ploughing resistance markedly. Magnetic two-share plouph reduced ploughing resistantce by about 21%,While magnetic four-share plough decreased ploughing resistance by about 10% and saved oil by about 10%. The principal mechanism is that magnetic field could cause the changes of soil physical chemical properties. For example, magnetic field could cause a reduction in the specific surface, cohesive force, shear force, zeta-potential etc. of soil and an. increase in the aggregation and water potential The results show that magnetic plough would be efficieat in reducing ploughing resistance, saving energy and improving soil physical and chemical properties.