Relationship between the Formation of Groundwater and the Evolution of Regional Hydrologic Cycle in North China Plain

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.The revival capacity of regional groundwater depends fundamentally on the evolutional course of the regional hydrologic cycle.The recharge of groundwater is sufficient in rainy period and is less so that the groundwater level and the sea surface decline in rain less period of the regional hydrologic cycle course.The latent capacity of utilizing groundwater is variable,which depends on the land processes of the regional hydrologic cycle.The land processes are adjusted to rise the utilization ratio.