Applying lime to acidic soil is one of the traditional neutralizing soil measures, which is easy to operate and the effect is significant. This study validated the optimum amount of lime to planting potatoes planted in acidic soil and its acid neutralizing capacity through field trials. These trails indicated that the application of 150 kg of lime per 667m2 can obtain the biggest increase in potato production. Compared with the contrast, it can increase the yield with 121 kg/667 m2, get more output value of 242 yuan/667 m2 and an increase of 12.12% in growth rate; meanwhile the net increase of output value reached 92 yuan/667 m2 and the ratio of output to input increased by 1.61. With the increasing use of lime, pH of the soil showed a significantly stepwise increase. Compared with the soil without applying lime, the pH value of soil applied 150 kg lime per 667 m2 increased 0.6 units, which took up 15.38%.%施用石灰是中和土壤酸性的传统措施之一，操作简便、效果显著。研究通过田间试验确定在马铃薯上施用石灰的最佳用量和对土壤酸性的中和能力。结果表明，每667 m2施用石灰150 kg 对马铃薯增产增收效果最佳，比不施石灰产量可提高121 kg/667 m2、产值增加242元/667 m2，增幅达到12.12%；净增产值92元/667 m2，增加的产出投入比为1.61；随着石灰用量的增加，土壤 pH 值呈明显阶梯状上升，与不施石灰比较，每667 m2施用石灰150 kg 可使土壤 pH 值提高0.6个单位，提升幅度达到15.38%。
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