Abstract: For improving the net power output of the organic Rankine cycle（ORC）by increasing the heat addition from heat source,this paper proposed the new configurations of ORC（organic Rankine cycle）combined with flash cycle（ORFC）and organic Rankine cycle combined with flash cycle with ejector（EORFC）. By adding flash cycle to the ORC,combined cycles of ORC with flash cycle are built. In ORFC and EORFC,the mass flow rate of working fluids can be increased（or adjusted）to adjust the locations of the pinch point of heat transfer,and therefore,the heat addition from the heat source and the net power output of the cycle are increased. Simulation results show that the optimum conditions of the new configured cycles are extended and the performance is improved. The maximum net power output in the optimum conditions of ORFC and EORFC is 16.13% and 33.18% higher than that of the ORC,respectively. The heat addition rate and exergy efficiency of the new cycles are also higher than that of the ORC.