The purpose of this research is to measure and evaluate the financial performance of car industries and part producer companies as a whole group in Iran stock exchange market in order to rank these industries and factories.The research was executed for 21 companies financial information on their liquidity ratio, activity ratio, debt ratio, profitability ratio, and capital market during 5 financial period of 2003-2007. The entropy statistic results showed that return on investment (ROI) ratio, operating profit ratio, and current ratio, which possess values of 0.295, 0.137, 0.080 respectively, have a high priority in identifying better companies Meanwhile, the rank of companies have not fully consistent, so the validity of results have been investigated through comparision between companie's rank by ROI, TOPSIS, taxonomy and linear assignment. The results showed that TOPSIS and taxonomy with ROI had significant relationship. So, TOPSIS and taxonomy are better for financial evaluation of companies. The result of TOPSIS showed that "Lent Toormoz", "Charkheshgar" and "Iran Rikhtehgari" with the best financal performance in Iran stock exchange market ranked first to third, respectively.