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This article discusses the forecasting of metal fatigue parameters, particularly the high cycle "S-N"-curve parameters. A qualitative connection between a corner of an inclination of the left branch of the fatigue curve to the N-axis of "S-N"-curve and limit of loading was established. The results of the study were used to examine the influence of different factors on the fatigue parameters in case of transition to their transformed forms. The method of transformation is based on the use of a reduction procedure. During reduction, the transformation of high cycle loading fatigue curve parameters is carried out. This transformation involves recalculating the break point coordinates of the high cycle loading part of the fatigue curve in accordance with the fatigue curve conditional parameters. This could be obtained using the result of crossing logarithmic coordinate axes by the left branch of the high cycle loading part of the fatigue curve.