地下电磁波法的解释工作，原用的直射线代数重建层析方法，从理论分析即能看出。存在着对小目标反映不明显的局限性．另一方面，实际观测到的场值是叠加场，包含目标的散射信息，在多重情况下有明显的规律，可以表示成一定的模式．借助正演，反映出这些场值的规律，这是建立模型模式的过程，它为一种新的解释方法──模式识别，打下了基础． The interpretation of underground electromagnetic wave method, the original direct algebraic reconstruction tomography method, that can be seen from the theoretical analysis. There are no obvious limitations to the small goals. On the other hand, the actual observed field values ​​are superposition fields, which contain the scattering information of the target. There are obvious rules in multiple cases and can be expressed as a certain pattern. With the help of forward law, which reflects the law of these field values, this is the process of establishing a model model, which lays the foundation for a new explanation method - pattern recognition.