Mitral stenosis is the most common type of rheumatic heart valve disease. Patients present with symptoms of left heart failure such as dyspnea, cyanosis, cough, hemoptysis, or signs and symptoms of right heart failure such as jugular vein anger, liver enlargement and pressure pain, positive hepatic jugular reflux sign, ascites, subcutaneous edema, and even formation of thrombus dislodged in the atria, causing embolic symptoms. The disease may be considered for percutaneous mitral balloon balloon formation. Percutaneous perforator balloon valvuloplasty is the treatment of choice for mitral stenosis, essentially replacing surgical mitral valve closure. It is most suitable for patients with moderate to severe mitral stenosis, whose orifice area is less than 1.5 cm2, without significant mitral regurgitation or only mild regurgitation, without significant aortic regurgitation, such as atrial fibrillation and atrial thrombus can also be operated electively after anticoagulation and thrombolysis, which can make patients exempt from surgical valve replacement in a certain number of years and maintain good heart function and life and activity. The specific steps are: 1. local anesthesia to puncture the femoral vein; 2. feeding the mitral balloon catheter, reaching the left ventricle through the septal foramen ovale, retracting the catheter, and filling the balloon to dilate the stenotic mitral valve to complete the operation.