本文对北京地区土壤背景值图的编制进行了全面、系统的总结。编制土壤背景值图的基础资料有302个样点的无素测定值和运用计算机制图和因素分析法揭露的元素区域分布规律。土壤背景值图是采用分级统计图的形式。其制图单元：山区以母岩，平原地区以成土母质类型和土壤质地作为划分依据；背景值的数量分级采用显着性检验分级法。

Mapping of soil background content in Beijing area is comprehensively and systematically presented in this paper. Basic data in mapping soil background content has 302 analytical data of soil elements and regional distribution which are mapped with computer plotting and factor analysis. The soil background content map is in statistic form and divided into grades; Criteria for dividing grades are parent rock in mountains and soil parent material and soil texture in plain area. Counties and districts are used as mapping units. Significant test is used by dividing grades of background content Maximum values of statistic error of background content in soil is mercury element in brown earth and cha soil, 18.4% and 12.9% respectively: All others are below 10%.