Due to the close relationship of construction with its upstream and downstream sectors such as basic metals and non-metallic minerals and real estate services, we can understand the importance of this industry in the country's economy. Inaccuracy of information has made lenders and borrowers make the right decisions regarding lending and borrowing, and credit rating can solve these problems by clarifying the situation and creditworthiness of the parties. Due to the existence of special conditions governing the construction industry in the country and being different from the conditions of other countries, it is not possible to optimally use foreign credit rating models. Therefore, the purpose of this thesis is to provide a credit rating model for construction industry companies. Based on the study and review of the texts and guidelines of the Moody's rating agency and the extraction of primary factors, the present research conducted interviews with experts and analysts of companies active in the construction industry and applied surveys and removed and added factors affecting the credit rating of companies and with Using form and content validity tests and confirmatory factor analysis as well as binomial test, the final indicators of the credit rating of the companies of this industry were extracted and finally, using the Friedman test, the prioritization and importance of these indicators were evaluated.