This paper discusses a broadband multilayer absorbing materials cement structure. By adding different proportions of graphite and the ferromagnetic material powder in the cement material,thus pro-cessed to form a structure absorbing material has a multilayer sandwich structure. Because of the short-comings in traditional measuring method,we further develop the electromagnetic parameter measurement method that unrelated to reference plane. First,we put forward a nonlinear equation for parameter extrac-tion which compared with the original equation and the mathematical properties of the function are better. So it can improve the convergence speed of solving in the iteration. Secondly,considering the iterative ini-tial value selection problem in the process of solving nonlinear equation ,nonlinear equations is given for the estimation of confidence region radius formula. Finally, in view of the actual cement samples were measured with electromagnetic parameter extraction calculation,the calculation results agree well with the measured results.%本文研究一种宽带多层水泥结构的吸波材料。通过在水泥材料中加入不同比例的石墨和铁磁粉末材料，并加工形成具有多层夹心结构的结构吸波材料。为了测量该结构吸波材料的等效电磁参数，我们进一步发展了与测量参考面无关的电磁参数测量方法，提出了一个用于参数提取的非线性方程，与原有的方程相比，该函数的数学性质更好，因而在迭代求解中会提高求解的收敛速度。其次，考虑迭代求解非线性方程过程中初值的选择问题，给出了针对该非线性方程的估计置信区域半径的公式。最后，针对该结构吸波材料进行了测量与等效电磁参数的分析计算，得到了有效介电常数和有效磁导率。
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