In recent years, with the development of crossing-river tunnels and subways, there are more and more symmetric foundation pits. Based on conformal mapping, the mathematical modeling is built and the expression of seepage discharge in pensile curtain foundation pit is deduced, then calculation parameters of seepage discharge are analyzed. The results showed that the seepage discharge of symmetric foundation pit has direct ratio with permeability coefficient and the water head between the outside and inside of foundation pit. And the seepage discharge of symmetric foundation pit is in inverse correlation to the ratio of the distance between the top of relative impermeable layer to the bottom of foundation pit and the distance between pensile curtains, to the ratio of the embedded depth of pensile curtain and the distance between the top of relative impermeable layer to the bottom of foundation pit, and to the ratio of water head between the outside and inside of foundation pit and the distance between the top of relative impermeable layer to the bottom of foundation pit.