according to the uncertain characteristics of blasting effect and safety when blasting method is used to treat open-air solitary rock group, the comprehensive evaluation model of blasting effect and safety of open-air solitary rock group is constructed by using the unascertained measure theory of calculating index weight with information entropy, and then the effect and safety of blasting method to treat solitary rock group are integrated with relevant engineering examples Evaluation. The results show that the evaluation model of blasting effect and safety based on unascertained measure theory, and the index weight calculated by information entropy and the confidence degree as recognition criteria, not only make the blasting effect and blasting safety quantitative, but also make the evaluation result more practical, and provide the selection and safety of similar engineering boulder group treatment methods More reliable theoretical basis for decision-making.