Since the recommendation method of industry criteria was complicated and time consuming,this paper proposed a rapid determination of cation exchange capacity(CEC)in Soil.By applying azotometer and shaker,the centrifugation and distillation were improved.The key processes and precautions of this method were also discussed.The results showed that the method had satisfied expression in precision and accuracy.It took less time and reagents,and increased efficiency by 45% as compared with the traditional method.It is especially suitable for mass and rapid determinations of soil samples.