Four model tests were carried in order to study the mechanical characteristics of piled isolated foundation.The soil resistance under the cap

the shaft resistance and the tip resistance of the piles were measured by installing various measuring gauges.Four integral p-s curves were also gotten.According to these test results

the piles in piled isolated foundation act different function factors at different stations.Under load board soil layer is compressed mainly in a range of one-time side length

the bigger shaft resistance is distributed between 1/4～1/2 on top of pile

after the small followed by a rebound.In the situation of invariable load board area

the limit capacity of the piled isolated foundation with smaller distance is bigger than that with longer distance.