The utility model belongs to the technical field of the relevant equipment technique of runway and specifically relates to an extending structure of runway, include from tying line runway primer layer, tying line clean plasm layer and tie line flower thick liquid layer certainly, first black grained layer has been laid from fixing between the upper surface on knot line runway primer layer and the lower surface from tying line clean plasm layer, deceive the grained layer from the fixed second of having laid between the upper surface on knot line clean plasm layer and the lower surface from tying line flower thick liquid layer, the utility model discloses the structure is through the contract elasticity of improvement runway structure that can be fine of the flexible extension pieces that sets up and second elasticity god, and the elasticity of two aspects about utilize second elasticity god to contract the increase runway that the first inflation body, the second inflation body and the third inflation body on the piece can be fine because the polyurethane material has the tensile strength requirement of regulation, from this, pierces through the runway surface course when the nail of motion spikes, and the mutual extrusion of personally experiencing sth. Part of the body through the inflation can not lead to the fact the fracture of polyurethane material.