Abstract: System models were established with Ebsilon software for the supercritical carbon dioxide recompression brayton cycle, and the process parameter design of the hundreds kW power cycle system was completed. Through analysis of calculation results, system process parameters were deeply explored to study the impact upon system power generation efficiency, product of the heat transfer coefficient and heat transfer area（KA） of the low temperature regenerator and the high temperature regenerator. There are reasonable combinations of the main compressor inlet temperature and inlet pressure to ensure high power generation efficiency and low KA. As the main compressor inlet temperature increases, the suitable main compressor inlet pressure also increases. Within this range, when the main compressor inlet temperature is constant, there is an approximate intersection point between curves of power generation efficiency with the split ratio of different main compressor inlet pressures. Classically, when the split ratio is less than this specific value, the closer the main compressor inlet pressure is to the critical pressure, the higher the system power generation efficiency is. When the split ratio is greater than this specific value, the farther the main compressor inlet pressure is from the critical pressure, the higher the system’s power generation efficiency is. The specific split ratio increases as the turbine inlet temperature increases. At the same split ratio（less than the specific split ratio）, the correlation between the change range of the power generation efficiency and the main compressor inlet pressure gradually decreases as the main compressor inlet temperature increases. When the main compressor inlet pressure is constant, the way of how the low-temperature regenerator KA changing with the split ratio is determined by the main compressor inlet pressure and the high-temperature regenerator KA increases with the split ratio. With the same split ratio, the larger the main compressor inlet pressure is, the larger the low temperature regenerator and the high temperature regenerator KA are.