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Introduction. The specifics of extinguishing fires in buildings and open spaces on the territory of the Russian Federation determines that a fire that has taken on a scale that allows it to be attributed to a large one is extinguished with the help of the forces and means of several fire and rescue units. In this case, a developed structure of the control system is created in order to improve the quality of management of a large number of fire and rescue units of different subordination. Goals and objectives. The purpose of the study is to analyze the structure of the control system created at large fires requiring the a significant number of fire and rescue units. To achieve the goal, it is necessary to solve the following tasks: 1) to identify the dependence of the dynamics of reliability of decision making on the experience of the operational work of fire and rescue garrison officials who perform the duties of the fire extinguishing driver.; 2) to determine the stage of accumulation of operational experience at which information, methodological and analytical support will bring maximum effect to potential fire extinguishing managers. Methods. To build the dependence of work experience and the probability of error when directing forces and means on fires, the Hala training model was used. Results and its discussion. An increase in the growth rate of decision reliability in a potential fire extinguishing supervisor is observed at the interval of operational work from 0 to 4 years, after which the growth rate decreases. Conclusions. In the characteristic dependence of the reliability of decision making on the experience of the operational work of the official performing the duties of the fire extinguishing manager, at the stage of exponential growth, the maximum effect of the positive change in the operational work experience on increasing the values of the reliability of decision making occurs. Key words: fire extinguishing, control structure, decision-making reliability.