Considering the characteristic of ocean environment for the future capital ship, the performance of marine inter-cooler( IC) gas turbine under the influence of the air temperature, seawater temperature, air humidity, air salinity and seawater salinity are analyzed. The results show that the air temperature is the chief factor which had made a great impact on the IC gas turbine. As the air temperature rise, the air mass flow, output power and efficiency are declined with varied grades. The seawater temperature increased, the output power and efficiency are decreased, but the degree is unapparent. The effect of air humidity is small in the normal temperature condition, but the impact on IC gas turbine cannot be ignored in high temperature condition. The air salinity and seawater salinity have impact on IC gas turbine for a certain extent.%针对未来大型船舶活动海区的海洋环境特点，分析了外界空气温度、海水温度、空气湿度、空气盐度、海水盐度等对船舶间冷循环燃气轮机的性能影响。研究结果表明，外界空气温度对间冷循环燃气轮机性能影响最大，随着外界空气温度的升高，间冷循环燃气轮机的进口空气流量、输出功率和效率均有不同程度的下降；随着海水温度的增加，机组效率和功率均下降，但影响不大；大气湿度在常温下影响较小，但在高温环境条件下不容忽视，空气盐度、海水盐度也会在一定程度上影响间冷循环燃气轮机的性能。
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