In order to get the quantitative geometry of defect, based on the introduction for the principle of pipeline' magnetic flux leakage, firstly a two-dimensional magnetic flux leakage signal was simulated by ANSYS software. It showed the basis characteristics of pipeline' magnetic flux leakage defects signal and put forward the corresponding interpretatioa Secondly, a contrast between internal and external defects magnetic flux leakage signal was made and the right two features were put forward. Finally according to the change law between the different features of magnetic flux leakage and the defects length, the quantification of defects length was completed. Through the comparison of different quantifying models, it made a general model of defects signals features and defects length, providing relevant parameters for the assessment and the prediction of strength and remaining life of pipeline and thus leading to proper maintenance for the pipeline.%为实现漏磁检测缺陷几何尺寸的量化,运用有限元Ansys软件仿真了管道缺陷的二维缺陷漏磁场,给出了漏磁场缺陷信号的基本特征,并对图形做出对应的解释；其次对内外缺陷漏磁场信号进行了对比,提出了合适的两个特征值；最后根据漏磁场不同特征值与缺陷长度的变化规律对缺陷长度进行了量化,通过对比不同量化模型,给出缺陷信号特征值与缺陷长度的一般关系模型,为管道强度以及剩余寿命评价等提供相关的参数,从而对管道进行维护.
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