Abstract: In this study, the dynamical characteristics of two-dimensional Janus particles in infinite electrolyte solution in the presence of an external electric field are considered. The equations for the electroosmotic flow in the electrolyte solution are established and decoupled on the basis of the order analysis. By introducing the finite computational domain to ensure the existence of the solution, the analytic solution of the electric field and the semi-analytical solution of the flow field around the circular particles are obtained. The relationship between the moments of the particle and the direction of the external electric field is obtained. The equilibrium attitude and the stability characteristics of the two-dimensional Janus particles are thus obtained.