Design and Discussion on Indoor and Outdoor Environmental Control of COVID-19 Hospitals. China CITIC Design Research Institute Co., Ltd. Chen Yanghua, Lei Jianping, Li Jun, Zhang Zaipeng. Abstract: Pneumonia caused by the novel coronavirus is a typical respiratory infectious disease. Controlling the source of infection, cutting off the chain of transmission, and protecting the safety of medical staff and patients are the main prevention and control measures. Based on the design of Wuhan Huoshenshan Hospital, this article analyzes the site design and building layout of COVID-19 hospitals, the "three zones and two corridors," the design scheme of ventilation and air conditioning systems for negative pressure wards and negative pressure isolation wards, and the air flow organization form and design technical points.