Abstract：Taking account of Shanghai Foundation Design Standard，the statistic criteria of Ps，fi and Psb for prefabricated pile are explored with the random field and the reliability theory，and the theoretical formulas to obtain the statistic characteristics of design parameters are put forward. For the convenience to employ the theoretical formulas in practice，a new analysis approach is derived on the basis of the correlation distance，pile dimensions and the calculating range of Psb and fP. The ultimate bearing capacity of prefabricated pile is estimated by CPT method at nineteen sites in Shanghai，and the statistic properties of the reliability index are obtained according to the numerical simulation results. Based on the results of reliability indexes and their statistic properties，the partial factors for defining the bearing capacity of prefabricated pile by CPT method are given in accordance with the complete reliability analysis. The presented research herein provides an alternative for the transition from the determinative design method of prefabricated pile bearing capacity to the probability one.
