The present invention relates to a simulator of lung compliance, comprising a torso, at least an artificial lung and an actuator, wherein the artificial lung is arranged between an upper board and a lower board in the torso, the upper board moves upwards to simulate the chest expansion when the artificial lung is inflated, and the actuator provides resistance for the inflation of the artificial lung to simulate the lung compliance. The invention also provides a medical patient simulator which comprises a device to simulate the lung compliance, a device to simulate the muscular activity and/ora device to simulate the increased pressure in the brain. The invention also relates to a method for simulating the lung compliance.