The interval non-probabilistic reliability analysis method may lead to conservative design under some conditions

and increase the project cost. To resolve the issue related to the applicability of interval non-probabilistic reliability method

the probability theory and Monte Carlo method are introduced

and the evaluation index for applicability is determined. Then the study method is proposed for application of the interval non-probabilistic reliability analysis method. Based on the analysis of practical problems

the applicability problem of interval non-probabilistic reliability analysis method is discussed

and the applicability of interval non-probabilistic reliability analysis method is investigated for different changing ranges of interval independent variables

number of interval independent variables and function types. The results show that when the changing range is relatively large and the number of interval independent variables is large

the applicability for interval non-probabilistic reliability analysis method is lacking. This study can provide a reference for the application of interval non-probabilistic reliability analysis methods.