The top of gypsum board should have keel, some wooden keel and some light steel keel. No matter what keel it is, it can be installed as long as it is found (screws are needed for installation). With an iron nail and a hammer, gently smash the nail on the top of the gypsum board. If we go in right away, there will be no keel. Where you can't get in, there are keels. If the installation direction of the bead curtain is parallel to the keel direction, you can draw a straight line at the position where the bead curtain is installed at the top of the gypsum board, and then cut several rectangular holes along the straight line with a utility knife, not too big, and the cut holes should preferably be covered by the shelf of the bead curtain. Then put a piece of wood, which should be cross-shaped with the opening (it is better to make this piece of wood bigger and longer. When placing the battens, apply some white latex for carpentry on the battens, and let the battens stick to the plasterboard, or nail a few hooks and hang a bead curtain. As long as you remember to install it on the keel, you can use your own understanding or way to buy suitable parts for installation.