1. Properly check the position and level of the main and auxiliary keels. The main and auxiliary keel slots are free of false cards and are tightly engaged. Tighten all connections to Zhong, Diaozhong and Gongmu. 2. Check the quality of the ceiling keel. The card-type main keel is 1mm, the auxiliary keel is 0.5mm, the side keel is 0.5mm, and the hanging bar is 8mm. 3. The distance between the main keel lifting points is 600-800mm, the distance between the main keel and the main keel is 800mm, and the distance between the two ends of the main keel is not more than 300mm. 4. When the hanging bars meet the equipment, the hanging point structure should be adjusted or the hanging bars should be added to ensure the quality. 5. The side keel adopts special corner keel. Jiuzheng Home Network reminds that it is not possible to use the auxiliary keel as a substitute. The wire should be elastically fixed on the wall first. 6. The distance between the auxiliary keel is 400mm, and the connection between the auxiliary keel and the side keel is fixed by pulling rivets. 7. When the length of the ceiling is greater than the length of the long keel, the keel shall be fixed by butt jointing. 8. According to the design of the suspended ceiling, stretch the wire on the top surface and surrounding walls. The spring line is clear and accurate, and the horizontal error should be ≤ 2mm.