在前人研究的基础上，结合北京地区地基土液限和塑限的相关关系，分析了区域土的液塑限关系的特点；尝试利用Bayes方法统计和分析土性参数，给出北京地区界限土的统计液限值。最后，给出有机质土的液塑限关系推导公式。

On the basis of previous studies,considering the correlation of liquidplastic limit of foundation soil in Beijing region, the features of liquid plastic limit relation of regional soil were analysed. Trying to use Bayes method to calculate and analyse soil characteristic parameters, the statistic liquid limit values of regional soil in Beijing are given. At last, a f of organic soil is derived.