Abstract: Enterprise informationization plays an importantrole for enterprise development, and itseffectiveness of performance evaluation raises more and more concern. Entropy weight, as an objective weight method, fully considers the information provided by evaluation index. Evaluation method of extenics, using quantitative description, can reflect comprehensive level of objects evaluated. By combining the priority degree evaluation method and entropy weight, in the process of performance evaluation of enterprise informationization, the objectivity and accuracy of the results can be achieved.