给出了基于“桶中能量法”的相位共轭保真度测量原理、方法与结果。通过对适当大小的空间滤波针孔能量透过率的直接测量可以得到相位共轭保真度并简单实现系数标定，给出了针孔大小的选择原则、系数标定方法和共轭保真度的计算公式以及单池受激布里渊散射相位共轭镜在几种条件下的实验结果，指明了这种方法的重要性与不足之处。 The principle, method and result of phase conjugate fidelity measurement based on “Energy Method in Barrel” are given. The phase conjugate fidelity can be obtained through the direct measurement of the energy transmissibility of the pinhole with the proper size and the coefficient calibration can be realized simply. The principle of pinhole size selection, coefficient calibration and conjugate fidelity The calculation results and experimental results of single-cell stimulated Brillouin scattering phase conjugate mirror under several conditions indicate the importance and deficiency of this method.