When the construction unit changes the fire escape into an office, it must obtain the audit and signature of the supervision unit. The supervision unit will evaluate the necessity, rationality and safety of the change application during the audit process, and conduct the audit. If the application for change complies with relevant regulations and there is no potential safety hazard, the supervision unit agrees to sign the opinions. The supervision unit has the right to refuse to sign the application for change that does not meet the requirements or has potential safety hazards, and put forward specific audit opinions and suggestions to ensure the quality and safety of the project.