Soil samples wereextracted by magnetic stirring and centrifugation，and four salt groups of exchangepotassium，sodium，calcium and magnesium in sample exchange fluid were determined by plasma emission spectroscopy. A set of determination method suitable for batch agricultural soil wasdeveloped，which wassimple，efficient and energysaving， stable and easy to master. The detection limit wasexchangeable potassium 0.025cmol/kg，exchangeable sodium 0.028 cmol/kg，exchangeable calcium 0.040cmol/kg，exchangeable magnesium 0.019 cmol/kg. The determination results of the national certified standard substances were consistent with the recommended value and met with the quality control requirements.