A method of coating a three-dimensional fabric has the steps of: preparing a three-dimensional fabric having two fabric layers and a plurality of vertical yarns connected between the two fabric layers; guiding the three-dimensional fabric with the two fabric layers vertically in the horizontal plane to an coating space, when the three-dimensional fabric moves in the coating space, a tension on the surface of the two fabric layers is between 5 and 25 kilograms (kg); applying an adhesive to the surface of the two fabric layers, and the adhesive spreading vertically and fluidly; and providing a reaction condition such that the adhesive dries into a film and forms a bonding layer.