Uncertainty information such as random

fuzzy

gray

unsure message widely exists in the geotechnical engineering. Due to the complexity of the practical situation and deficiency of experiment data

calculation parameters are usually the mixture of multi uncertainty. Against this character

using the blind data to express the uncertainty of the calculation parameters

the theory of blind information is applied to the rigid limiting equilibrium method for slope stability; and a new method of computing safety factor is put forward. The corresponding confidence level of safety factor in different numerical value intervals is computed by use of blind data algorithms; consequently the more comprehensive result is provided to judge the stability state of slope

overcoming the defect of absolutely definitive description in the traditional methods. The case study indicates that the blind data can consider the practical situation better in the slope stability analysis; and the result is more detailed and reliable

having good practical values.