Hidden records are divided into civil works and installation, and the requirements and contents of each province are different. Where are you? Let's talk about the filling of content changes first: 1. Project name (needless to say, fill in according to the drawing, and then add a bracket to the unit project to mark it separately) 2. Construction execution standard and name number (this is used to fill in enterprise standards, otherwise it is not required) 3. Number of times to fill in the hidden form (only once when completing an item) 4. Hidden part (writing axis position) 5. Concealed foundation (write the number of all relevant drawings) 6. Concealed content (specify the specifications and models of materials used, embedded parts, the number of second-round exam reports of materials, the contents of construction quality acceptance and relevant construction tests and test results. )