Hi800 is suitable for patients with mild to moderate hypoxemia, such as hypoxic respiratory failure, ARDS, pneumonia, pulmonary fibrosis, and cardiogenic pulmonary edema. It has a positive therapeutic effect on patients with simple hypoxic respiratory failure (type I respiratory failure). Features include innovative independent pipeline design and avoidance of pollution to the internal air circuit of the host, thus avoiding cross-infection of different patients. The optimized airflow is more stable and comfortable. The flat panel design is conducive to disinfection and observation from a distance.