One-dimensional models of analyzing gas turbines as a whole require characteristic curves ofand the characteristic curve of compressor's efficiency of stages so that compressor performance would be predicted.Variation of stagger angle of the stage's inlet guide vane stated as a geometrical variation of the stage would be resulted in the displacement of pressure coefficient characteristic curve based on the stage's flow coefficient. Performance nature of compressor stage is in a way that under this condition, the efficiency characteristic curve will remain intact. In this paper, a method would be presented to predict variations of pressure coefficient characteristic curve based on flow coefficient against variations in stagger angle of stage's guide vane so that onedimensional modeling of axial flow compressor would be made, through characteristic curves.