Abstract: The effect of magnetic treatment on corrosion resistance of low carbon steel joint was studied.The experiment showed that the etching rating can be reduced by magnetic treatment at a relative level of 2.58%.A finite element analysis was carried out for predicting the residual stress that influenced the corrosion resistance of joint.In addition,a significance test for the change of the etching rating after magnetic treatment was performed.It showed that the change of the etching rating after treatment is out of the range of experimental error with the significance coefficient of 5%.It could be concluded that the corrosion resistance of low carbon steel joint can be improved by magnetic treatment with a significance level of 5%.