研究了铁磁材料弯曲应力状态下表面产生的应力对磁声发射强度的影响，它比单纯拉伸和压缩应力状态的影响要复杂；通过波形分析发现压应力和拉应力使磁声发射波形的相关函数下降，并且有相似变化规律；通过加载和卸载过程中所得到磁声发射强度的变化规律，可用以评估材料中微观损伤及残余应力。 The effect of the stress generated on the surface of the ferromagnetic material under bending stress on the magneto-acoustic emission intensity is studied, which is more complicated than that of pure tensile and compressive stress states. It is found from the waveform analysis that compressive stress and tensile stress make the magnetoacoustic emission waveform The correlation function is decreased, and there is a similar variation law. The variation law of the intensity of the magneto-acoustic emission obtained during loading and unloading can be used to evaluate the microscopic damage and residual stress in the material.