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By using interval value, to reflect the parameter selection of soil parameter selection of uncertainty characteristics, and according to the characteristics of the corresponding parameter establishing parameter selection method to determine the interval value. To research foundation settlement calculation method based on the reliability analysis model of the ground interval. Using interval theory and one-dimensional optimization algorithm, and using the reliability index of interval reliability evaluation criterion to evaluate ground settlement, which based on the interval theory ground reliability analysis method. Engineering example analysis shows that this method has certain rationality.