“…More recently, Ji and Li [15] considered the persistence of solitary wave solutions of the delayed coupled Higgs field equation by using the method of dynamical system and the geometric singular perturbation theory. Besides, there are many literatures are the relevant applications on geometric singular perturbation theory, see [16,17,18,19,20,21,22]. More precisely, Zeng, Sun and Yu [23] considered the system (1.1) with D(u) = 1, F (u) = a 0 +2a 1 u, R(u) = u(u 2 −1)(u 2 +β).…”