This product is suitable for children with spontaneous breathing. It can achieve auxiliary ventilation without traumatic operation such as endotracheal intubation. Under certain conditions, the effect of adjusting respiratory function can be comparable to or even better than that of invasive ventilator, which greatly reduces the complications of infection, bleeding, oral mucosa and respiratory tract trauma caused by the use of invasive ventilator. Safe, reliable and effective auxiliary respiratory system is a safe, effective, convenient and can quickly restore the normal body function of infants. Clinical function 1. It can provide a safe and controllable oxygen concentration (FiO2) for infants 2. It can effectively maintain the functional residual volume (FRC) 3. Can help reduce the work of breathing (WOB) done by infants 4. It can reduce the need for invasive mechanical ventilation 5. It can provide the baby with the best comfortable gas 6. It can significantly reduce the incidence of chronic lung disease (CLD) 7. It can improve some non lung physiological indexes, such as height and weight 8. In order to avoid the medical accidents caused by oxygen poisoning, the pure oxygen supply mode can be replaced