A method for automatically judging the damage degree of cardiac valve includes such steps as using three or more heart sound microphones to simultaneously record the heart sounds, separating the sounds to obtain the heart sound signals of aortic valve, pulmonary valve, tricuspid valve and mitral valve, digital signal processing to them to obtain sample signals, convolution operation to obtain system transition function, and comparing it with reference database to obtain the damage result. Its system is also disclosed. |