Abstract:The interval values are used to denote the soil mechanical parameters,which can reflect the uncertainty of parameters values. The determining methods are also proposed according to the characteristics of parameters. The interval non-probabilistic reliability analysis model of strip foundation bearing capacity is developed based on study of calculation method of foundation bearing capacity. And the interval non-probabilistic reliability analysis model of strip foundation settlement is also established based on the settlement calculation method. Then,the solution of non-probabilistic reliability indexes is performed by interval theory and one-dimensional optimization algorithm. The comprehensive evaluation is carried out through the established reliability evaluation rules. The interval non-probabilistic reliability comprehensive analysis method for strip foundation stability based on bearing capacity and settlement is finally presented,which can reflect the influence of bearing capacity and settlement on strip foundation stability comprehensively. The calculation of engineering examples proves the feasibility of the method,which perfects the method and theory of reliability analysis for strip foundation.