Due to the sublimation and perfection of human knowledge in economics, the concept of efficiency developed in the past two decades and the measurement of it, based on different theories and practice. In economics, efficiency means the maximum of possible output from a certain amount of input. The efficiency is very important for developing countries Because these countries face to a shortage of inputs, production factors and technologies. So the usage of existing resources is critical for these countries. This paper aims to evaluate and rank the financial performance of the chemical firms listed in Tehran stock exchange. We Use the data environment analysis and TOPSIS methods. This research includes one major question that which company performs better due to the financial ratios. The sample includes the firms in Tehran Stock Exchange within a 3-year period (2013-2015). The Results show that Ahvas Petrochemical company, Persian Gulf Petrochemical Industry company and Iran Chemical Industries company are more efficient than others.
