The object of this doctoral thesis is the research of the TQM models influence on achieving business excellence level. In accordance with the defined problem, the intent is to detect and present possible improvements of business system and management system in its entirely, by analysed methods and business excellence models. Results of the research prove auxiliary and main hypotheses. Modelled and implemented quality management system in accordance with the requirements of ISO 9001:2008 international norm contributes to the TQM model performance of organization. Modelled, documented and implemented to management system, the risk management process enables the risk management in other business processes, which also means in the management system in entirely. In this way, the risk management process contributes to the TQM system performance. The process of contracting, as well as the risk management within, is very important from the aspect of business excellence as an essential element of modern TQM models. The quality of business excellence models depends on the level of materialization of the QM (Quality Management) and TQM principles. It is not possible to establish and develop TQM system and achieve the business excellence level without risk management and use of risk management model in the management system. Without this, the management system would be exposed to high level of entropy, which would make it insufficiently competitive on the market. Scientific contribution of the doctoral thesis has theoretical and practical aspect. The theoretical aspect is in identification and presentation of connection between risk management in business processes, process approach and TQM principles. The practical aspect is the establishment of the risk management model in process of contract concluding, and in use of this model in that process, which by the quality of its result significantly effects the reliability of the whole process structure which is structural element of management system. The established model of risk management, with appropriate adjustment, is practically applicable to non productive business processes in the organization. The practical aspect is the establishment of TQM - model of organization, generally applicable, too.