Defibrillator is a kind of first aid equipment mainly for arrhythmia, atrial fibrillation, ventricular fibrillatin and other short-term fatal heart diseases. It is widely used in hospitals, airports and schools (70% of people in foreign countries operate AED, so the places where people gather will be equipped). The scheme is concise and stable, and each functional area is properly arranged, with compact structure and reasonable operation.