This research aims to identify and measure the role of TQM in the process of developing  the financial  performance of  Diyala State Company and show the reality and obstacles, after applying the company's management to the requirements of ISO 9001: 2008 and compare it with its performance before applying this standard, The researcher measured the financial performance by conducting financial analysis of the financial statements and conducting a number of interviews at the company's headquarters, Diyala State Company (one of the Iraqi Ministry of Industry and Minerals formations) was selected as a research community as it was in the process of rehabilitating and modernizing its production lines and It obtained the ISO International Certificate in mid-May 2015, The results of this research showed that there are different roles on the indicators of their financial performance as a result of the application of the quality standard. Some of them improved compared to the pre-application level, while some of them declined to witness a significant decline. The company suffers a number of obstacles that negatively effect on its financial performance, The most important recommendation for this research is  overcoming on all obstacles and challenges that have hindered the process of applying quality in order to improve the financial performance of the company by taking advantage of the aspects that the application of the quality standard have a positive role it and work on its development and process the negative ones.