Abstract: In order to study the practical utilization of the solar-hybrid gas turbine system,constructing an experimental system is necessary. The usual idea to do so is to couple the current well-performed model gas turbine with the solar collection and heating component. However,the performance indicators of the coupled system are limited compared to those of the model gas turbine. In this paper,the thermodynamic performance principle analysis for the reasons of performance limitation is carried out. The EBSILON software is used to establish the simulation model of the model gas turbine and the calculation model of the solar-hybrid micro gas turbine experimental system. The thermodynamic performance principle analysis result is verified by calculation. The flow capacity of the combustion chamber is found to be the main factor limiting the system performance. Increasing the compression ratio of the compressor and the flowing capacity of the combustion chamber,organizing better combustion are given as system optimization directions.