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In order to improve the utilization rate of geothermal energy and realize the comprehensive utilization of geothermal energy. In this paper, a comprehensive utilization system using geothermal energy is proposed, and the thermodynamic performance under different working conditions is studied and analysed. And the Pareto method is used to optimize the calculation of different optimization options. The conclusions are as follows: The system can supply heating, cooling and electricity at the same time, and can regulate the electricity and cooling capacity according to the demand. The optimal pressure exists in the system in front of the turbine inlet to maximize the net output power of the system (when k=0). Due to heating needs, the adjustable range of k decreases with increasing of the turbine inlet pressure when the pressure of the turbine inlet is greater than 13.83 MPa. When there are differences in the importance of different output objectives, the Pareto solution is different. The importance degree of output objectives can be defined according to the demand, so as to solve the corresponding optimal solution.

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