Abstract: Solar energy coupled gas turbine power generation can improve the performance of gas turbine combined cycle system. Based on the design data of C200 micro gas turbine, the rationality of the model is verified by using natural gas as fuel. Based on the combined cycle system, a solar collector is added, natural gas and biogas are selected as fuel, and the influence of collector location and environmental conditions on the operation performance of the combined cycle system of solar energy coupled gas turbine is studied. The results show that under the same output power of the unit, the fuel flow of the biogas system without collector is nearly doubled compared with that of the natural gas system, but the gas flow difference is small, the combined cycle system has similar performance, the gas turbine electro-mechanical efficiency is about 30%, and the waste heat efficiency reaches 33%. The addition of solar collectors can reduce the fuel flow and improve the operation performance of the unit. When the collector is located in front of the regenerator, the electrical efficiency of the system increases slightly, and the waste heat efficiency increases to more than 50%. When the collector is behind the regenerator, the fuel flow decreases significantly, and the electrical efficiency can reach more than 39%, and the waste heat efficiency can reach 42%. Under the same output power condition, with the increase of solar radiation intensity and ambient temperature, the maximum fuel flow rate reductions of natural gas and biogas system are 39.48% and 37.88%, the electrical efficiencies increased by 19.41% and 17.91%, and the waste heat efficiencies increased by 40.13% and 40.16%. The residual heat of the system increases more when the collector is located in front of the regenerator. When the collector is behind the regenerator, the electro-mechanical efficiency of the gas turbine rises more, and the residual heat also increases.