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The dish type solar thermal concentrating system can collect the solar energy above 800℃. It has a concentration ratio of 800 and total reflector area of 49㎡. To operate solar receivers at high temperature, the optimum aperture size is obtained from a comparison between maximizing absorbed energy and minimizing thermal losses.The system efficiency is defined as the absorbed energy by working fluid in receiver divided by the energy coming from the concentrator. We find that system efficiency is stable in case of flow rate of above 6lpm. The system efficiency are 64.9% and 65.7% in flow rate of 6lpm and 8lpm, respectively. The thermal performance showed that the maximum efficiency and the factor of thermal loss in flow rate of 8lpm are 68% and 0.0508.Keywards : 태양열 집광시스템(Solar thermal Concentrating system), 열성능(Thermal Performance)태양열 흡수기(solar absorber/receiver)