In　this　paper,　a　new　estimation　method　is　presented　for　the　toe　bearing　behavior　of　non-displacement　piles　embedded　into　bearing　strata　of　sand.　The　method　is　developed　by　numerical　experiments.　First,　a　new　in-situ　test　is　proposed　whose　results　can　identify　five　parameters　of　a　bearing　stratum　uniquely.　These　are　parameters　of　the　stress-strain　relations　of　sand　and　coefficient　of　earth　pressure　at　rest.　In　the　in-situ　test,　a　cylinder　of,　for　example,　10　cm　in　diameter　is　embedded　into　the　bearing　stratum.　The　measured　results　are　a　load-settlement　relation　at　the　end　of　the　cylinder　and　a　friction-settlement　relation　on　the　surface　of　the　cylinder.　These　relations　are　back-analyzed,　using　elastic-plastic　finite　element　method　and　neural　network,　and　the　parameters　are　identified.　Then　using　the　identified　parameters,　the　toe　bearing　behavior　of　a　pile　is　estimated　by　the　elastic-plastic　finite　element　method.　The　estimation　method　can　be　applied　to　piles　embedded　into　over-consolidated　sand　as　well　as　normally　consolidated　sand.