承压井水位的变化反映了含水层孔隙压力的变化，而含水层孔隙压力的变化与含水层所受的压力状态有密切的关系。本文利用华北地区反应固体潮较好的承压井水位资料，通过计算各井孔的潮汐因子并提取有效的水位趋势信息，反演了华北地区现有承压井孔含水层体应变，并绘制了2009 ～ 2012 年半年尺度的等值线图。结果显示，本文计算结果能在一定程度上反映出华北地区深层的应力应变状态。

The change of the confined aquifer level reflects the pore pressure change，and the pore pressure change of the aquifer is closely related to the aquifer pressure． The paper used the tidal response of the well water level data in the North China region，calculated the tidal factor of each well and extracted the effective water trend information． Then we inverted the volumetric strains of existing confined aquifer well in the North China region，and drew the contour maps on the basis of half a year from 2009 to 2012． Ｒesults show that it can reflect the deep state of stress and strain to a certain extent in the North China region．

2013 年度震情跟踪合同制定向工作任务( 2013020307 ) 及2014 年度地震科技星火计划项目(XH14005Y)共同资助