Abstract: Nursing ventilator can make patients have a more convenient and comfortable treatment environment,and it is suitable for the treatment of mild and moderate respiratory disorders. Because of its low price,small volume and convenient usage,nursing ventilator has entered the public family. The pressure control system for the ventilator is designed in the paper,and the overall idea of control algorithm design is clarified. An adaptive method is selected and based on the system,the fuzzy-PID dual-mode control algorithm is used to realize the pressure control. The experimental results show that the output pressure of the pressure control system is stable,and the phenomenon of pressure overshoot and oscillation is reduced,which improves the ventilation stability and the using comfort of patients. The nursing ventilator can meet the basic functional requirements,and the usage of the ventilator lows the use threshold of family users.