The　calculation　of　displacements　and　internal　forces　of　the　cantilever-retaining　pile　for　foundation　pit　using　biparameter　method　of　foundation　resistance　is　discussed.　That　is　on　the　assumption　that　the　foundation　resistant　coefficients　varies　nonlinearly　with　the　depth　according　to　biparameter　theory;　the　strata　are　modeled　by　elastic　foundation　link　elements　and　the　soil-retaining　piles　are　modeled　by　elastic　beam　elements.　Based　on　the　real　measured　data,　the　numerical　simulation　back-analysis　of　the　cantilever-retaining　pile　for　foundation　pit　indicates　that　the　proper　parameters　of　foundation　resistance　for　practical　design　could　be　obtained　through　trial　and　adjustment.　And　the　method　is　applied　to　practical　analysis　and　design　of　the　cantilever-retaining　pile　in　Fuzhou.　The　result　is　satisfactory,　so　it　could　be　referred　by　the　design　and　the　calculation　of　the　cantilever-retaining　piles　for　foundation　pits.