Abstract:A concision plane symmetric aircraft has the characteristics of high lift drag ratio and strong coupling between lateral-directional channels. This paper analyzes the coupling control mechanism of lateral-directional channels of the symmetrical aircraft，constructs the system model of lateral-directional channels，carries out the integrative design of aerodynamic and control，and derives the LCDP stability criterion parameter constraint condition. The simulation analysis is carried out with a specific example. The results show that the lateral-directional stability of the symmetrical aircraft can be achieved only by using a pair of horizontal control surfaces.