The coefficients of permeability of the aquifers around the deep foundation pit were comprehensively analyzed through dewatering tests based on the test results in the preliminary design stage. The deep foundation pit of the pumping station,which is in the entrance region of the canal project of water diversion from the Changjiang River to the Hanjiang River, was taken as an example. By analyses of the dewatering test results through both the formulas recommended by the specification of pumping test and the numerical simulation, the permeability coefficients of different aquifers were obtained. These coefficients provided basic data for the planning of foundation pit dewatering in the later stage. The dewatering plan was improved remarkably by the designers according to the dewatering test results.