[en] Key words: Large Solar Furnace, Mirror concentrating system, reflecting surface, system of technical sight, photometer, concentrator, heliostat, facet. Subjects of the inquiry: optical surfaces separate facet and concentrator as a whole. State of adjust facet of heliostats and concentrator. Distributions of energy in focal zone of the concentrator. Aim of the inquiry: creations new and development of existing methods of the control and measurement of the optic-power characteristics of beam concentrators of energy. Method of inquiry: the analysis of the created methods of the control and adjust on the basis of geometrical optics, photometry and modern information technology. The results achieved and their novelty: 1. Methodical errors of measurement cavity calorimetric, radiometric and photo-electric gauges of the concentrated solar radiation for the first time are determined. 2. An experimental estimation of accuracy adjusting of facet of the concentrator by a method of the chamber-obscure for the first time is carried out. 3. The technique of definition of factors of mirror reflection facets of heliostats and concentrator in operating conditions is developed the express train. The practical value of work consists that on the basis of the received results was developed methods of the control and adjusting fasets of concentrator, which have resulted in increase of accuracy of measurements, reduction of expenses of time on control adjusting of work, have ensured transition basically from qualitative parameters of the control and adjusting on quantitative parameters. Degree of embed and economic effectivity: Results of researches and the developed equipment it is introduced at Bukhara State University and Kirghiz - Uzbek University also are used at operation LSF with capacity of 1000 kw. Sphere of usage: The results of researches and the developed equipment can be used in area solar radiation engineering at creation and operation of solar concentrators. (author)