Abstract: Based on three-axis magnetoresistive sensor HMC5983, this paper designed a magnetic memory detection probe, developed based on USB2I2C control module of the two-dimensional metal magnetic memory detection system. In this paper, the metal magnetic memory test was carried out on the samples of 45steel. By analyzing the two-dimensional components of the leakage magnetic field and analyzing the area size of the Lissajous figure of the differential component, it is determined the severity of the stress concentration in the test blocks. The results show that the magnetic memory two-dimensional detection can accurately locate the residual stress concentration of the test piece. And from the perspective of gradient changes, it can predict the severity of stress concentration assessment.