通过等温恒应变速率压缩实验，按最小二乘法原理，采用多元非线性回归方法，建立了ＦＧＨ９５合金的本构关系。与多元线性回归结果对比表明，应用非线性回归方法建立的本构关系精度较高，物理意义明确。本文所用建立本构关系的方法具有适用性，可用于其它工程材料。 Through isothermal constant strain rate compression experiments, according to the principle of least squares, the constitutive relation of FGH95 alloy was established by multivariate nonlinear regression method. Compared with the results of multivariate linear regression, it shows that the constitutive relation established by nonlinear regression method has high precision and definite physical meaning. The method used to establish the constitutive relationship used in this paper has applicability and can be used in other engineering materials.