Abstarct: In line with the use of renewable energy for power generation, a central tower power plant with Brayton power generation is suggested. In the present study, the closed Brayton cycle power generation unit is with helium factor fluid and two organic Rankine cycles combined with the Brayton cycle. Organic Rankine Cycles After the Turbine Output and Compressor were put to low pressure. In this study, the solar power plant using a specific number of mirrors is designed in such a way that facilitates analysis of all places and times. In the present study, the effects of time, location, compressor pressure ratio in the Brighton cycle, the Rankin cycle fluid factor, the input temperature to helium turbine on the cycle performance are investigated. The results indicate that the maximum production capacity on the first day of October at 14 o'clock will be 13.5 MW in Gorgan and 14.2 MW in Tabriz. The energy and exergy efficiency of the Brayton cycle in pressure ratio 2 in Gorgan and on the first day of July is 53% and 74%, and in Tabriz, it is and . At a pressure ratio of 2.5 during the first day of October, the maximum efficiency of the first and second law in Gorgan was 61.17%, 85.3% and in Tabriz it's and . The greatest loss of energy and exergy occurs in the plant at the heliostat farm. The main reason for this, is the high temperature difference between the source of thermal radiation and mirrors. the present study is designed in such a way that there is no blockage effect on the heliostat field. Among the organic fluids investigated in the R236fa organic cycle, the highest efficiency of the first law was 17.93% for the Rankin 1 cycle and 15.82%for the Rankin cycle and the highest power output was M/W2. at the end the exergy-economic factor of the power generation cycle at a radiation intensity of 1000 wm and a pressure ratio of 2.5 is obtained 27.23%.