In this paper, based on the ANSYS simulation software, the electromagnetic-stress double coupling model of the electro-magnetic rail driver was established considering armature rail contact. And the solving steps was put forward. Based on this, the corresponding program is developed using APDL language, and the stress and strain laws of the armature under electromagnetic force are analyzed. At the same time, the influence of grid distortion on the electromagnetic field was analyzed, thereby more clearly revealing the dynamic characteristics of the pivot rail contact surface. The stress and strain of the armature continuously increase with the increasing current and decrease with the decreasing current. From the perspective of the yielding parts of the armature, the first to yield is the two sharp edges of the contact surface of the armature, and then gradually transitions to the periphery along the contact length and width. From the perspective of the yielding parts of the armature, the first to yield is the two sharp edges of the contact surface of the armature, and then gradually transitions to the periphery along the contact length and width. In the latter half of the driving process, there is a significant difference in the distribution of electromagnetic field and temperature field when considering ablation and not considering ablation.