Differential settlements often give great damage to structures on soft stratum. In the paper the authors develop a new method for predicting differential settlements mainly of reclaimed land.
　At first many observed settlement records of port facilities and reclaimed lands are collected. Statistic analysis of them show that the settlements can be described by a normal distribution or a longnormal distribution.
　Sensitivity analysis of settlement on the basis of one dimensional consolidation theory shows that variability of soil parameters affects more than other factors to the differential settlement.
　A numerical simulation program is developed to calculate variability of settlements. In this program soil parameters are given as probabilistic random variables and spartial difference of loading condition is taken into consideration. The calculated results agree well with the observed records, proving that the differential settlements are well predicted by the simulation program.