“…On the other hand, integral boundary conditions are considered to be more reasonable than the local boundary conditions, which can depict phenomena of heat transmission, population dynamics, blood flow, etc. A large number of results about fractional differential equations with integral boundary condition have been obtained, see [9,10,[30][31][32][33][34][35][36][37][38][39][40][41][42][43] and the references cited therein. Meanwhile, we note that the coupled systems of fractionalorder differential equations have also attracted much attention due to their extensive applications, we refer to [3,9,10,14,22,29,[32][33][34][35][36][37][38][39][40][41][42][43].…”