1. First, fill in the title of ventilation operation, date, place, participants and other related information at the top of the record form.

2. Secondly, list the existing risks and dangerous factors, such as gas leakage, harmful substance exposure and poor ventilation.

3. Thirdly, evaluate each risk and determine its severity.

4. After that, list the corresponding control measures for each identified risk.

5. Finally, designate the person responsible for implementing and supervising each control measure, and determine the expected completion time.