以发育在第四纪红土上的黄筋泥和红砂岩母质上的红砂土为试材，经磁化处理后进行测定。结果表明，适当的磁场强度下（０．１５～０．３５Ｔ），土壤呼吸作用增强，放线菌菌落数增加，转化酶和磷酸酶提高，而细菌生长和过氧化物酶，脲酶活性受到抑制。高磁场（０．８０Ｔ）对土壤微生物和酶活性均产生抑制作用。 Yellow-sand soil developed on the Quaternary red clay and red sandstone on the red sandstone were used as materials to conduct the determination after magnetization treatment. The results showed that under suitable magnetic field strength (0.15 ~ 0.35T), soil respiration increased, the number of actinomyces colonies increased, invertase and phosphatase increased, while bacterial growth and peroxidase and urease activities were inhibited . High magnetic field (0.80T) has inhibitory effect on soil microorganism and enzyme activity.