Performance measurement is an approach targeting use of the resources of the system economically, actively, profitably and efficiently and that is the basis of the identification of deficiencies and development of improvement applications. Financial performance analyses are frequently used in order to detect problems, to create new strategies for targets in terms of several variables in the insurance sector as in all other sectors. Many decision-making processes related to economic, industrial, financial or social issues involve multiple criteria. In line with these criteria, analytical solution methods are needed to finalize the decision making process by rational decisions and multi-criteria decision-making processes are used. PROMETHEE method frequently used in financial performance measurements is used in this study. This method has been developed in accordance with the predetermined criteria for selecting the best alternative, and offers decision makers the opportunity to see all data related to the problem on an easily understandable table.In this study, performances of the companies operating in the non-life industry in Turkish Insurance Sector were examined in line with the data sheet for the time period 2010 to 2013. By comparing the performance rankings of non-life insurance companies on the basis of years, possible causes are determined depending on the variables involved in the change of the performance of these companies by determining stable companies, as well as unstable companies. In addition, policies they can apply in accordance with the potential improvements in these variables are offered as suggestions