Abstract: Medium and low-speed maglev trains rely on the suspension electromagnet to generate electromagnetic attraction to achieve suspension and guidance, and in view of the design of the structural parameters of the suspended electromagnet, a method based on electromagnet-thermal coupling simulation is proposed to optimize the research of the suspended electromagnet. Through the structural analysis of the electromagnet, two methods of internal and external buckle of the suspended electromagnet are proposed,and a three-dimensional finite element parametric calculation model is established respectively to analyze the main heat source and heat flux calculation method. Under the condition that the temperature rise of the electromagnet does not exceed the set value, the optimization algorithm is used to improve the buoyancy-to-weight ratio of the suspended electromagnet, and the structural parameters are solved optimally. The simulation results show that under the condition of ensuring that the suspension force meets the requirements, the mass of the electromagnet is reduced by 43% after the internal buckle operation of the proposed method, and the mass of the electromagnet is reduced by 58% after the external buckle operation, and the steady-state temperature rise of the electromagnet does not exceed the set value. The proposed design scheme is more realistic and provides a certain reference basis for subsequent design.