Taking the main foundation pit dewatering project of Dayangzhuang Station on Line R1 of Jinan Urban Rail Transit as an example, the research shows that the clay of porous clay stratum developed in Jinan region has unique spatial reticulated pore and pore structure. Comparing and analyzing the results of four permeability tests, the permeability coefficients measured by laboratory test and sonar seepage test are small, which differ greatly from the actual formation permeability; the permeability coefficients measured by pumping test and recharge test are close, far greater than that of common clay, and the permeability coefficients are presented with the increase of recharge pressure. Linearity improvement, recharge caused a small rise in the surrounding groundwater level, limited scope of influence, in line with Jinan pore viscous soil layer rich in water and good permeability characteristics, with unique and distinct regional characteristics. Relevant experimental results can provide reference for design, construction and spring water environmental protection of foundation pit dewatering and recharge in relevant areas.