With the increasing pace of science and knowledge in today, s world, the company in order to comply with the condition environment variable to use communication technology and capital investment in this technology is growing rapidly. Performance evaluation is one of the main concerns for monitoring this agreement. Recently applied the theory of data envelopment analysis (DEA) and grey theory for performance evaluating has been highly regarded. Considering the importance of telecommunications as a leader in the field of communication technology and necessary to evaluate the performance of these two techniques have been used in this study. For this mining first set of criteria in evaluating the financial performance of telecommunication and the importance (weight) each was determined using the number of grey. Then, technique of using DEA model for evaluating and ranking the telecommunications companies were presented. The result indicates that the major telecommunication companies province in Markazi, Tehran and Khuzestan have the best financial performance.