Aiming at expansive soil judgment in Xiangtan-Shaoyang Expressway, the attribute recognition model based on objective weight is developed in this paper. The verification and application of this model indicate that the methodology is coherent to that of the Specifications for Design of Highway Subgrades and the fuzzy synthetic evaluation method. Because the attribute recognition theory would well determine some kind of synthetic evaluation problem with fuzzy attributes and its confidence criterion is developed in terms of some evaluation sets with ordered characteristics, furthermore,this model uses objective weight as the weight of the evaluation indices, decreases the subjectivity of weight decision, and ensures the objectivity of evaluation, thus the evaluation results are much more reliable.