Abstract: To ensure the rapidity and synchronization of multiple parallel circuit breakers, a parallel drive electromagnetic repulsion mechanism is proposed. Its stress distribution characteristics and optimization methods are studied. Firstly, the finite element model of the mechanism is established, and the stress distribution characteristics are analyzed by simulation, and it is found that the structure has two stress concentration areas. Then, the characteristic parameter k of the Lorentz force distribution of the mechanism is extracted, and the analytical form of k with the dimension parameter and the number of turns of the coil is theoretically deduced. The analytical form is obtained through simulation calculations, and the effect of k value on the maximum stress of the mechanism is investigated. It is found that there exists a better k value which makes the maximum stress of the mechanism smaller. Finally, the 1/6 model of the mechanism is analyzed, and it is concluded that the stress of the mechanism is smaller in radial force equilibrium. Moreover, the analytical calculation method of k value in radial force equilibrium is given, and it is verified that the analysis is correct by comparing the better k value of the stress under different structural simulations and analytical calculations. Combined the analytical relationship of k and the calculation method of k value in radial force equilibrium, the parameters can be adjusted to optimize the stress of the mechanism, and the method can be used to design the parameters of electromagnetic repulsion mechanism with parallel drive.