以铁磁材料20号钢平板拉伸试样为试验对象，在地磁场环境下试验了拉应力对试件表面磁记忆二维信号的影响。结果表明随着静载荷逐渐增大，试件表面磁记忆二维信号出现先增大后减小再增大的现象，并且在圆孔附近出现法向信号过零点、切向信号出现极大值的现象。此外，还对检测结果进行多特征量的分析，为现有的单一角度评判标准提供了更多地分析角度。

This article selects 20# steel as the tablet tensile specimens for research, the impact of tensile stress on the two- dimensional magnetic memory signal on the surface of the specimen is studied in the geomagnetic field. The results show that: as the static load increases gradually, the specimen surface two-dimensional magnetic memory signal first increases then decreases and afterwards increases again; near the round hole the normal signal appears to zero value phenomenon, and the tangential signal has a great value; In addition, the test results of research and analysis of multi-feature criteria for existing single angle provides more analysis point of view.