Ideal point method is a method commonly used in multiobjective decision analysis. That basic idea is to target the problem by constructing a multiobjective ideal solution and negative ideal solution

and take close to the ideal solution or away from the negative ideal solution as basis to evaluate the objects. Based on the ideal point method

a model of tunnel surrounding rock classification is established. It has great influence on the final evaluation results for the reasonable weight values of the evaluation indices. The rough set theory is adopted to determine the weights

and the problem of weights is converted into the attributes significance estimating in rough set. The method is fully derived by engineering samples

and no experience is necessary

with a strong operational. Finally

the model of tunnel surrounding rock classification is established based on rough set and ideal point method

and is applied to the practical engineering. The results show that this method is reliable and provides a new idea to surrounding rock classification