The molten carbonate fuel cell (MCFC) performances of a pressured MCFC/MGT hybrid system using a fixed micro-gas turbine (MGT) design were analyzed for off-design operation with different control methods. The effects of current density and MCFC temperature were considered for the MCFC modeling, and the modeling and experimental result were comparied. The off-design operation of the MGT was modeled by the performance characteristics of the compressor and turbine. Four control methods were mentioned for the part-load operation of the hybrid system, and the performances of MCFC were analyzed for the different methods using the system model. The results show that the efficiency of MCFC at partload operation can be higher than the design value by using the control method. The performance of MCFC has great effects on the system, the system performance can be improved by maintaining the MCFC operation temperature.