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The accurate steady-state model is the basis for the study of the three major characteristics of aero-engine. By the component characteristic modeling method, establish the steady-state model of civil aviation high Bypass- Ratio turbofan engine. The study found that When the flight altitude and Ma number remains constant, the thrust increases as the engine rotating speed increases, but at a high rotating speed, the thrust increases slowly. In the range of low rotating speed to middle rotating speed, the Specific Fuel Consumption（SFC）decreases with the increase of rotating speed; in the middle rotating speed to high rotating speed range, SFC increases with the increase of rotating speed. When the flight altitude and engine rotating speed is constant, the total thrust of the engine tends to decrease when the Ma number is increased, and the SFC increases sharply with the increase of the flight speed. When Ma number and the engine rotating speed remains constant, the thrust decreases as the height increases. At height range of 0-11Km, the SFC drops as the height increases, and the SFC remains the same after the height exceeds 11Km, but this is obtained without considering the Reynolds number correction；The low Reynolds number effect will cause the SFC of the engine to rise after 11Km.