The pattern recognition method of pipe mfl signals is put forward , the features of signals are extracted from the recorded flux leakage response and characterizing definition is introduced as well ; the main - part analysis , nonlinear regression , statistical methods are studied and used to establish characterization and compensation algorithms , the quantitative estimation of defect geometry and the result accuracy are accepted 引入了缺陷漏磁信号的模式识别方法，提出了缺陷漏磁场及缺陷外形尺寸的特征量；实现了用主成分分析、多元非线性回归和统计识别分析等方法对缺陷漏磁信号波形进行特征提取和定量识别，精度在误差准许范围内。
In this paper , first of all , we discuss the basic theory of the two dimensions magnetic flux leakage testing , which is the basic of the design of " the monitor system of two dimensions magnetic flux leakage testing equipment for the steel tube " . we also discuss some distributing characteristic about the magnetic field in the magnetic flux leakage testing 在本文中首先讨论了二维漏磁检测法的基本原理，这是“钢管二维漏磁检测设备监控系统”设计的基础。还讨论了漏磁检测中漏磁场的一些分布特性。
