Abstract:The operation efficiency of gas turbine is very sensitive to the operating load，while the gas turbine plant in China mainly undertakes the peak load regulation function. The long-term operation of gas turbine in partial load range greatly reduces the system operation efficiency and leads to a great waste of energy. Aiming at the problem that the efficiency of gas turbine is reduced under partial load， this paper puts forward the technology of improving the efficiency of gas-fired power plants air inlet heating， and demonstrates the feasibility of the technology application from the economic point of view combining with the practical project of the air inlet system transformation of Tianjin Huadian Fuyuan thermal power plant. The research results show that the intake heating technology can significantly improve the operation efficiency of gas turbines under partial load conditions. The reconstruction project can recover the investment in about three years，which is economically feasible，and has a good market application prospect.