Taking the example of Jiangnan working shaft of Changde Yuanjiang river-crossing tunnel, based on the obtained hydrological characteristics and the surrounding strata conditions, the paper makes a preliminary analysis on various aspects such as pumping test, well location layout, anti-inrush checking, settlement analysis and recharge surrounding the foundation pit, and the technical measures related to dewatering are reviewed. The feasibility of the dewatering scheme has been demonstrated through the engineering practice, which will be meaningful to the deep foundation pit construction in the similar high water-rich and strong permeable cobble stratum.