本文分析北京城区31个样点土壤pH值,讨论北京城区土壤pH值的分布特征和存在的问题。按土壤pH值大小,北京城区土壤pH值呈从中心到四周由低到高,再由高变低,并且呈北向南递减的特点。北京城区土壤pH处于正常范围内,但未来北京城区土壤有发生酸化的可能,有针对性地提出防止土壤酸化的对策。 In this paper, the soil pH values ​​of 31 sample plots in Beijing urban area were analyzed to discuss the distribution characteristics and existing problems of soil pH value in Beijing urban area. According to the soil pH value, Beijing urban soil pH value from the center to four weeks from low to high, and then from high to low, and decreased from north to south features. The soil pH in Beijing urban area is within the normal range, but the soil in Beijing urban area may be acidified in the future and the countermeasures to prevent soil acidification are proposed in a targeted way.