The objective of this study is to provide an analytical approach to the dewatering forecast of deep foundation pit under the condition of waterproof curtain. The hydrogeological model is generalized in a case study of deep foundation pit of Wuhan Changjiang Shipping Center. Effectiveness of waterproof curtain is analyzed using field pumping test. A modified non-complete well group formula associated with the mirror method is used to conduct the dewatering forecast. The results are therefore compared with numerical results and measured results respectively. Results show that simplified hydrogeological condition is confined aquifer. The effectiveness waterproof curtain of the eastern side is the worst. The north is better than the south

and the best is on the west side. According to the calculation results of original well spacing plan

there will not be safe in the south of deep foundation pit. Dewatering effect is improved after adding two dewatering wells. The analytic solution is consistent with the numerical results and the measured results.