The stethoscope is an instrument that can detect abnormalities in the lungs, more commonly different pathologic sounds, such as phlegm sounds, dry rales, wet rales, rales, tubular breath sounds, as well as bursting sounds, hypopnea, and so on, can be heard by the stethoscope, and a judgment can be made about the patient’s condition. If the patient has pulmonary edema, acute heart failure, in the lung auscultation can be heard in the blister sound, etc.. For diuretic, cardiac, dilate blood vessels and other symptomatic treatment, the effect is very ideal, clinical tuberculosis, tumors, can also be through the auscultation of the initial judgment, including the hearing of the cavity, the effect is also very good. For the use of the stethoscope, need to be in the application of the doctor, the patient for the relevant diagnosis and treatment, is part of the diagnosis of visual touch percussion hearing.