The formation of groundwater is closely related with the evolution of regional hydrologic cycle in periodicity in North China Plain since the last phase of the Pleistocene.

• 晚更新世以来华北平原地下水形成、演变与区域水文循环演化的周期性密切相关，区域地下水资源的形成能力取决于区域水文循环演化的进程。