<p>In order to study the characteristics of electromagnet, this paper present an electromagnet used in track-change-interlocking mechanism of three-dimensional braiding machine. When the slider proper connection, the electromagnet begins to work, its electromagnet force should bigger than the impact force of slider and carrier base. The force analysis of carrier base is conducted by mathematical method, the electromagnet model is simulated in the COMSOL Multiphysics simulation software, get the surface of electromagnet, magnetic vector potential of electromagnet and electromagnetic force the electromagnet. Then use ADAMS software to simulate the carrier base crash to the chassis, get the max impact force during track change process. The impact force is 3.26% less than electromagnet force, indicate that the electromagnet can used in track-change-interlocking mechanism of three-dimensional braiding machine. Use the experiment to validate these models, the results show that the experiment is basically consistent with the simulation and can prove the accuracy the simulation.</p>