The　calculation　formulas　for　water　inflow　of　a　circular　foundation　pit　with　different　insertion　depths　of　waterproof　curtain　are　proposed　based　on　the　principle　of　seepage　continuity　of　groundwater　and　Darcy＇s　law.　The　analytical　solution　of　ground　subsidence　outside　the　foundation　pit　with　different　insertion　depths　of　waterproof　curtain　is　proposed　according　to　the　method　of　resistance　coefficient　widely　used　in　ship　engineering　in　China.　Finally,　an　applicable　procedure　of　dewatering　of　foundation　pit　with　waterproof　curtain　partially　penetrating　aquifers　was　developed,　in　which　water　control　cost　is　set　as　the　target,　and　ground　subsidence　and　groundwater　inflow　are　set　as　the　constraints　conditions　considering　both　safety　and　economy　of　foundation　pit　design.　The　proposed　optimization　method　for　water　control　was　applied　in　a　project　site　in　Tongzhou　district,　Beijing.　©　2021,　Editorial　Department　of　Journal　of　Northeastern　University.　All　right　reserved.